[IR] Change copy method into shallowCopy in Native

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InitializersLowering.kt

@@ -86,7 +86,7 @@ internal class InitializersLowering(val context: CommonBackendContext) : ClassLo
                     declaration.initializer =
                             if (initExpression is IrConst<*> &&
                                     declaration.correspondingPropertySymbol?.owner?.isConst == true) {
-                                IrExpressionBodyImpl(initExpression.copy())
+                                IrExpressionBodyImpl(initExpression.shallowCopy())
                             } else {
                                 null
                             }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/InteropLowering.kt

@@ -814,7 +814,7 @@ private class InteropTransformer(val context: Context, override val irFile: IrFi
         require(initializer is IrConst<*>) { renderCompilerError(expression) }
 
         // Avoid node duplication
-        return initializer.copy()
+        return initializer.shallowCopy()
     }
 
     override fun visitCall(expression: IrCall): IrExpression {