Add test for obsolete issue

#KT-10494

compiler/testData/codegen/box/localClasses/nameWithWhitespace.kt

@@ -0,0 +1,8 @@
+// IGNORE_BACKEND: JS
+
+fun `method with spaces`(): String {
+    data class C(val s: String = "OK")
+    return C().s
+}
+
+fun box(): String = `method with spaces`()