[clang] [Clang] Implement CWG2918 'Consideration of constraints for address of overloaded function' (PR #127773)

[Younan Zhang via cfe-commits]

================
@@ -13443,9 +13499,9 @@ Sema::resolveAddressOfSingleOverloadCandidate(Expr *E, 
DeclAccessPair &Pair) {
     return nullptr;
 
   if (Result) {
-    SmallVector<const Expr *, 1> ResultAC;
     // We skipped over some ambiguous declarations which might be ambiguous 
with
     // the selected result.
+    // FIXME: This for-loop is dead code. Remove it?
----------------
zyn0217 wrote:

The only way `AmbiguousDecls` comes with elements is on line 13433, where we 
also set `IsResultAmbiguous` to true. However, we bail out of the function on 
line 13442 when IsResultAmbiguous

https://github.com/llvm/llvm-project/pull/127773
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