Make IrValueDeclaration.type mutable

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

@@ -15,5 +15,5 @@ abstract class IrValueDeclaration : IrDeclarationBase(), IrDeclarationWithName,
     abstract override val descriptor: ValueDescriptor
 
     abstract override val symbol: IrValueSymbol
-    abstract val type: IrType
+    abstract var type: IrType
 }

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

@@ -36,7 +36,7 @@ class IrVariableImpl(
     override var origin: IrDeclarationOrigin,
     override val symbol: IrVariableSymbol,
     override val name: Name,
-    override val type: IrType,
+    override var type: IrType,
     override val isVar: Boolean,
     override val isConst: Boolean,
     override val isLateinit: Boolean