Refactor calls and related expressions

compiler/testData/ir/irText/calls.txt

@@ -2,28 +2,28 @@ IrFile /calls.kt
   IrFunction public fun foo(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
-        VAR x
+        GET_VAR x
   IrFunction public fun bar(/*0*/ x: kotlin.Int): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
         CALL .foo
-          x: VAR x
+          x: GET_VAR x
           y: LITERAL Int type=kotlin.Int value='1'
   IrFunction public fun qux(/*0*/ x: kotlin.Int): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
         CALL .foo
           x: CALL .foo
-            x: VAR x
-            y: VAR x
-          y: VAR x
+            x: GET_VAR x
+            y: GET_VAR x
+          y: GET_VAR x
   IrFunction public fun kotlin.Int.ext1(): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
-        $RECEIVER of: <root>
+        $RECEIVER of: ext1
   IrFunction public fun kotlin.Int.ext2(/*0*/ x: kotlin.Int): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
         CALL .foo
-          x: $RECEIVER of: <root>
-          y: VAR x
+          x: $RECEIVER of: ext2
+          y: GET_VAR x

compiler/testData/ir/irText/dotQualified.txt

@@ -2,10 +2,10 @@ IrFile /dotQualified.kt
   IrFunction public fun length(/*0*/ s: kotlin.String): kotlin.Int
     IrExpressionBody
       RETURN type=kotlin.Int
-        CALL .length PROPERTY_GET
-          $this: VAR s
+        GET_PROPERTY .length
+          $this: GET_VAR s
   IrFunction public fun lengthN(/*0*/ s: kotlin.String?): kotlin.Int?
     IrExpressionBody
       RETURN type=kotlin.Int?
-        CALL ?.length PROPERTY_GET
-          $this: VAR s
+        GET_PROPERTY ?.length
+          $this: GET_VAR s

compiler/testData/ir/irText/extensionPropertyGetterCall.txt

@@ -7,5 +7,5 @@ IrFile /extensionPropertyGetterCall.kt
   IrFunction public fun kotlin.String.test5(): kotlin.String
     IrExpressionBody
       RETURN type=kotlin.String
-        CALL .okext PROPERTY_GET
+        GET_PROPERTY .okext
           $receiver: $RECEIVER of: test5

compiler/testData/ir/irText/references.txt

@@ -6,7 +6,7 @@ IrFile /references.kt
   IrProperty public val ok2: kotlin.String = "OK" getter=null setter=null
     IrExpressionBody
       RETURN type=kotlin.String
-        CALL .ok PROPERTY_GET
+        GET_PROPERTY .ok
   IrProperty public val ok3: kotlin.String getter=<get-ok3> setter=null
   IrPropertyGetter public fun <get-ok3>(): kotlin.String property=ok3
     IrExpressionBody
@@ -15,21 +15,21 @@ IrFile /references.kt
   IrFunction public fun test1(): kotlin.String
     IrExpressionBody
       RETURN type=kotlin.String
-        CALL .ok PROPERTY_GET
+        GET_PROPERTY .ok
   IrFunction public fun test2(/*0*/ x: kotlin.String): kotlin.String
     IrExpressionBody
       RETURN type=kotlin.String
-        VAR x
+        GET_VAR x
   IrFunction public fun test3(): kotlin.String
     IrExpressionBody
       BLOCK type=kotlin.Nothing
         DUMMY KtProperty
         RETURN type=kotlin.Nothing
-          VAR x
+          GET_VAR x
   IrFunction public fun test4(): kotlin.String
     IrExpressionBody
       RETURN type=kotlin.String
-        CALL .ok3 PROPERTY_GET
+        GET_PROPERTY .ok3
   IrProperty public val kotlin.String.okext: kotlin.String getter=<get-okext> setter=null
   IrPropertyGetter public fun kotlin.String.<get-okext>(): kotlin.String property=okext
     IrExpressionBody
@@ -38,5 +38,5 @@ IrFile /references.kt
   IrFunction public fun kotlin.String.test5(): kotlin.String
     IrExpressionBody
       RETURN type=kotlin.String
-        CALL .okext PROPERTY_GET
+        GET_PROPERTY .okext
           $receiver: $RECEIVER of: test5