IR: remove some usages of deepCopyWithVariables

At this point, `deepCopyWithVariables` is the same as
`deepCopyWithSymbols` except that the former doesn't call
`patchDeclarationParents`, which most likely produces incorrect IR in
some call sites.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt

@@ -921,10 +921,8 @@ fun IrValueParameter.copyTo(
         factory.createExpressionBody(
             startOffset = originalDefault.startOffset,
             endOffset = originalDefault.endOffset,
-            expression = originalDefault.expression.deepCopyWithVariables(),
-        ).apply {
-            expression.patchDeclarationParents(irFunction)
-        }
+            expression = originalDefault.expression.deepCopyWithSymbols(irFunction),
+        )
     }
     return factory.createValueParameter(
         startOffset = startOffset,