Psi2Ir: Fold constants when generating IR

This is necessary to avoid stack overflow errors on large constant
expressions.

compiler/testData/ir/irText/stubs/constFromBuiltins.fir.kt.txt

@@ -0,0 +1,4 @@
+val test: Int
+  field = Companion.<get-MIN_VALUE>()
+  get
+

compiler/testData/ir/irText/stubs/constFromBuiltins.fir.txt

@@ -0,0 +1,11 @@
+FILE fqName:<root> fileName:/constFromBuiltins.kt
+  PROPERTY name:test visibility:public modality:FINAL [val]
+    FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]
+      EXPRESSION_BODY
+        CALL 'public final fun <get-MIN_VALUE> (): kotlin.Int declared in kotlin.Int.Companion' type=kotlin.Int origin=GET_PROPERTY
+          $this: GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Companion modality:FINAL visibility:public [companion] superTypes:[kotlin.Any]' type=kotlin.Int.Companion
+    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.Int
+      correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun <get-test> (): kotlin.Int declared in <root>'
+          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]' type=kotlin.Int origin=null

compiler/testData/ir/irText/stubs/constFromBuiltins.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // DUMP_EXTERNAL_CLASS: kotlin.Int
 
 val test = Int.MIN_VALUE

compiler/testData/ir/irText/stubs/constFromBuiltins.kt.txt

@@ -1,4 +1,4 @@
 val test: Int
-  field = Companion.<get-MIN_VALUE>()
+  field = -2147483648
   get
 

compiler/testData/ir/irText/stubs/constFromBuiltins.txt

@@ -2,8 +2,7 @@ FILE fqName:<root> fileName:/constFromBuiltins.kt
   PROPERTY name:test visibility:public modality:FINAL [val]
     FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]
       EXPRESSION_BODY
-        CALL 'public final fun <get-MIN_VALUE> (): kotlin.Int declared in kotlin.Int.Companion' type=kotlin.Int origin=GET_PROPERTY
-          $this: GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Companion modality:FINAL visibility:public [companion] superTypes:[kotlin.Any]' type=kotlin.Int.Companion
+        CONST Int type=kotlin.Int value=-2147483648
     FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.Int
       correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
       BLOCK_BODY

compiler/testData/ir/irText/stubs/simple.fir.kt.txt

@@ -0,0 +1,4 @@
+val test: Int
+  field = 2.plus(other = 2)
+  get
+

compiler/testData/ir/irText/stubs/simple.fir.txt

@@ -0,0 +1,12 @@
+FILE fqName:<root> fileName:/simple.kt
+  PROPERTY name:test visibility:public modality:FINAL [val]
+    FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]
+      EXPRESSION_BODY
+        CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=PLUS
+          $this: CONST Int type=kotlin.Int value=2
+          other: CONST Int type=kotlin.Int value=2
+    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.Int
+      correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public final fun <get-test> (): kotlin.Int declared in <root>'
+          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]' type=kotlin.Int origin=null

compiler/testData/ir/irText/stubs/simple.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // !DUMP_DEPENDENCIES
 
 val test = 2 + 2

compiler/testData/ir/irText/stubs/simple.kt.txt

@@ -1,4 +1,4 @@
 val test: Int
-  field = 2.plus(other = 2)
+  field = 4
   get
 

compiler/testData/ir/irText/stubs/simple.txt

@@ -2,9 +2,7 @@ FILE fqName:<root> fileName:/simple.kt
   PROPERTY name:test visibility:public modality:FINAL [val]
     FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]
       EXPRESSION_BODY
-        CALL 'public final fun plus (other: kotlin.Int): kotlin.Int [operator] declared in kotlin.Int' type=kotlin.Int origin=PLUS
-          $this: CONST Int type=kotlin.Int value=2
-          other: CONST Int type=kotlin.Int value=2
+        CONST Int type=kotlin.Int value=4
     FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.Int
       correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
       BLOCK_BODY