Make InsertImplicitCasts work with Descriptors and KotlinTypes again

This is a temporary change to make sure IrType infrastructure work is in
master.

It causes some of irText tests to work incorrectly (as in master).

compiler/testData/ir/irText/expressions/coercionToUnit.txt

@@ -36,8 +36,7 @@ FILE fqName:<root> fileName:/coercionToUnit.kt
             BRANCH
               if: CONST Boolean type=kotlin.Boolean value=true
               then: CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-                $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-                  GET_VAR 'val tmp0_safe_receiver: java.io.PrintStream? [val] declared in <root>.test3' type=java.io.PrintStream? origin=null
+                $this: GET_VAR 'val tmp0_safe_receiver: java.io.PrintStream? [val] declared in <root>.test3' type=java.io.PrintStream? origin=null
                 x: CONST String type=kotlin.String value="Hello,"
       TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
         BLOCK type=kotlin.Unit? origin=SAFE_CALL
@@ -52,6 +51,5 @@ FILE fqName:<root> fileName:/coercionToUnit.kt
             BRANCH
               if: CONST Boolean type=kotlin.Boolean value=true
               then: CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-                $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-                  GET_VAR 'val tmp1_safe_receiver: java.io.PrintStream? [val] declared in <root>.test3' type=java.io.PrintStream? origin=null
+                $this: GET_VAR 'val tmp1_safe_receiver: java.io.PrintStream? [val] declared in <root>.test3' type=java.io.PrintStream? origin=null
                 x: CONST String type=kotlin.String value="world!"

compiler/testData/ir/irText/expressions/implicitCastOnPlatformType.txt

@@ -2,6 +2,5 @@ FILE fqName:<root> fileName:/implicitCastOnPlatformType.kt
   FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.String 
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun test (): kotlin.String declared in <root>'
-        TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
-          CALL 'public open fun getProperty (key: kotlin.String?): kotlin.String? declared in java.lang.System' type=kotlin.String? origin=null
-            key: CONST String type=kotlin.String value="test"
+        CALL 'public open fun getProperty (key: kotlin.String?): kotlin.String? declared in java.lang.System' type=kotlin.String? origin=null
+          key: CONST String type=kotlin.String value="test"

compiler/testData/ir/irText/expressions/jvmStaticFieldReference.txt

@@ -2,16 +2,14 @@ FILE fqName:<root> fileName:/jvmStaticFieldReference.kt
   FUN name:testFun visibility:public modality:FINAL <> () returnType:kotlin.Unit 
     BLOCK_BODY
       CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-        $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-          GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
+        $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
         x: CONST String type=kotlin.String value="testFun"
   PROPERTY name:testProp visibility:public modality:FINAL [var] 
     FUN name:<get-testProp> visibility:public modality:FINAL <> () returnType:kotlin.Any 
       correspondingProperty: PROPERTY name:testProp visibility:public modality:FINAL [var] 
       BLOCK_BODY
         CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-          $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-            GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
+          $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
           x: CONST String type=kotlin.String value="testProp/get"
         RETURN type=kotlin.Nothing from='public final fun <get-testProp> (): kotlin.Any declared in <root>'
           CONST Int type=kotlin.Int value=42
@@ -20,8 +18,7 @@ FILE fqName:<root> fileName:/jvmStaticFieldReference.kt
       VALUE_PARAMETER name:value index:0 type:kotlin.Any 
       BLOCK_BODY
         CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-          $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-            GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
+          $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
           x: CONST String type=kotlin.String value="testProp/set"
   CLASS CLASS name:TestClass modality:FINAL visibility:public superTypes:[kotlin.Any]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestClass 
@@ -37,8 +34,7 @@ FILE fqName:<root> fileName:/jvmStaticFieldReference.kt
               if: CONST Boolean type=kotlin.Boolean value=true
               then: BLOCK type=kotlin.Int origin=null
                 CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-                  $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-                    GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
+                  $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
                   x: CONST String type=kotlin.String value="TestClass/test"
                 CONST Int type=kotlin.Int value=42
       FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> ($this:<root>.TestClass) returnType:kotlin.Int 
@@ -51,8 +47,7 @@ FILE fqName:<root> fileName:/jvmStaticFieldReference.kt
     ANONYMOUS_INITIALIZER isStatic=false
       BLOCK_BODY
         CALL 'public open fun println (x: kotlin.String?): kotlin.Unit declared in java.io.PrintStream' type=kotlin.Unit origin=null
-          $this: TYPE_OP type=java.io.PrintStream origin=IMPLICIT_NOTNULL typeOperand=java.io.PrintStream
-            GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
+          $this: GET_FIELD 'FIELD IR_EXTERNAL_JAVA_DECLARATION_STUB name:out type:java.io.PrintStream? visibility:public [final,static] ' type=java.io.PrintStream? origin=GET_PROPERTY
           x: CONST String type=kotlin.String value="TestClass/init"
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean 
       overridden:

compiler/testData/ir/irText/expressions/sam/samConstructors.txt

@@ -34,8 +34,6 @@ FILE fqName:<root> fileName:/samConstructors.kt
                 BLOCK_BODY
                   RETURN type=kotlin.Nothing from='local final fun <anonymous> (a: kotlin.Int?, b: kotlin.Int?): kotlin.Int declared in <root>.test4'
                     CALL 'public final fun minus (other: kotlin.Int): kotlin.Int declared in kotlin.Int' type=kotlin.Int origin=MINUS
-                      $this: TYPE_OP type=kotlin.Int origin=IMPLICIT_NOTNULL typeOperand=kotlin.Int
-                        GET_VAR 'a: kotlin.Int? declared in <root>.test4.<anonymous>' type=kotlin.Int? origin=null
-                      other: TYPE_OP type=kotlin.Int origin=IMPLICIT_NOTNULL typeOperand=kotlin.Int
-                        GET_VAR 'b: kotlin.Int? declared in <root>.test4.<anonymous>' type=kotlin.Int? origin=null
+                      $this: GET_VAR 'a: kotlin.Int? declared in <root>.test4.<anonymous>' type=kotlin.Int? origin=null
+                      other: GET_VAR 'b: kotlin.Int? declared in <root>.test4.<anonymous>' type=kotlin.Int? origin=null
               FUNCTION_REFERENCE 'local final fun <anonymous> (a: kotlin.Int?, b: kotlin.Int?): kotlin.Int declared in <root>.test4' type=kotlin.Function2<kotlin.Int?, kotlin.Int?, kotlin.Int> origin=LAMBDA

compiler/testData/ir/irText/expressions/sam/samConversionsWithSmartCasts.txt

@@ -106,10 +106,9 @@ FILE fqName:<root> fileName:/samConversionsWithSmartCasts.kt
       CALL 'public open fun run1 (r: java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=null
         $this: CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.J' type=<root>.J origin=null
         r: TYPE_OP type=java.lang.Runnable? origin=SAM_CONVERSION typeOperand=java.lang.Runnable?
-          TYPE_OP type=kotlin.Function0<kotlin.Unit> origin=IMPLICIT_NOTNULL typeOperand=kotlin.Function0<kotlin.Unit>
-            CALL 'public open fun id <T> (x: T of <root>.J.id?): T of <root>.J.id? declared in <root>.J' type=kotlin.Function0<kotlin.Unit>? origin=null
-              <T>: kotlin.Function0<kotlin.Unit>?
-              x: GET_VAR 'a: kotlin.Function0<kotlin.Unit> declared in <root>.test8' type=kotlin.Function0<kotlin.Unit> origin=null
+          CALL 'public open fun id <T> (x: T of <root>.J.id?): T of <root>.J.id? declared in <root>.J' type=kotlin.Function0<kotlin.Unit>? origin=null
+            <T>: kotlin.Function0<kotlin.Unit>?
+            x: GET_VAR 'a: kotlin.Function0<kotlin.Unit> declared in <root>.test8' type=kotlin.Function0<kotlin.Unit> origin=null
   FUN name:test9 visibility:public modality:FINAL <> () returnType:kotlin.Unit 
     BLOCK_BODY
       CALL 'public open fun run1 (r: java.lang.Runnable?): kotlin.Unit declared in <root>.J' type=kotlin.Unit origin=null