[clang] [Clang] fix overload resolution for object parameters with top-level cv-qualifiers in member functions (PR #110435)

[via cfe-commits]

================
@@ -1073,3 +1073,10 @@ int main() {
   return foo[]; // expected-error {{no viable overloaded operator[] for type 'Foo'}}
 }
 }
+
+namespace GH100394 {
+struct C {
+  void f(this const C);
+  void f() const ;      // ok
+};
----------------
cor3ntin wrote:

Here is a fun test 
```
struct C {
  void f(this const C);
  void f(this volatile C) ;  
};

(deprecated but should be handled nevertheless)

https://github.com/llvm/llvm-project/pull/110435