IR: make IrField.type mutable

compiler/ir/ir.tree.impl/src/org/jetbrains/kotlin/ir/declarations/impl/IrFieldImpl.kt

@@ -33,7 +33,7 @@ class IrFieldImpl(
         override var origin: IrDeclarationOrigin,
         override val symbol: IrFieldSymbol,
         override val name: Name,
-        override val type: IrType,
+        override var type: IrType,
         override var visibility: DescriptorVisibility,
         override val isFinal: Boolean,
         override val isExternal: Boolean,

compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrField.kt

@@ -35,7 +35,7 @@ internal class PersistentIrField(
         origin: IrDeclarationOrigin,
         override val symbol: IrFieldSymbol,
         override val name: Name,
-        override val type: IrType,
+        type: IrType,
         override var visibility: DescriptorVisibility,
         override val isFinal: Boolean,
         override val isExternal: Boolean,
@@ -94,4 +94,14 @@ internal class PersistentIrField(
                 setCarrier().metadataField = v
             }
         }
+
+    override var typeField: IrType = type
+
+    override var type: IrType
+        get() = getCarrier().typeField
+        set(v) {
+            if (type !== v) {
+                setCarrier().typeField = v
+            }
+        }
 }

compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/carriers/FieldCarrier.kt

@@ -11,8 +11,10 @@ import org.jetbrains.kotlin.ir.declarations.MetadataSource
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.expressions.IrExpressionBody
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
+import org.jetbrains.kotlin.ir.types.IrType
 
 internal interface FieldCarrier : DeclarationCarrier {
+    var typeField: IrType
     var initializerField: IrExpressionBody?
     var correspondingPropertySymbolField: IrPropertySymbol?
     var metadataField: MetadataSource?
@@ -23,6 +25,7 @@ internal interface FieldCarrier : DeclarationCarrier {
             parentField,
             originField,
             annotationsField,
+            typeField,
             initializerField,
             correspondingPropertySymbolField,
             metadataField
@@ -35,6 +38,7 @@ internal class FieldCarrierImpl(
     override var parentField: IrDeclarationParent?,
     override var originField: IrDeclarationOrigin,
     override var annotationsField: List<IrConstructorCall>,
+    override var typeField: IrType,
     override var initializerField: IrExpressionBody?,
     override var correspondingPropertySymbolField: IrPropertySymbol?,
     override var metadataField: MetadataSource?

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrField.kt

@@ -22,7 +22,7 @@ abstract class IrField :
     @ObsoleteDescriptorBasedAPI
     abstract override val descriptor: PropertyDescriptor
 
-    abstract val type: IrType
+    abstract var type: IrType
     abstract val isFinal: Boolean
     abstract val isExternal: Boolean
     abstract val isStatic: Boolean