IR: make IrTypeAlias.expandedType mutable

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

@@ -24,7 +24,7 @@ abstract class IrTypeAlias :
     abstract override val descriptor: TypeAliasDescriptor
 
     abstract val isActual: Boolean
-    abstract val expandedType: IrType
+    abstract var expandedType: IrType
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitTypeAlias(this, data)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyTypeAlias.kt

@@ -43,7 +43,7 @@ class IrLazyTypeAlias(
         }
     }
 
-    override val expandedType: IrType by lazy {
+    override var expandedType: IrType by lazyVar {
         withInitialIr {
             typeTranslator.buildWithScope(this) {
                 descriptor.expandedType.toIrType()