[clang] [clang][Sema] fix incorrect ambiguous function call which use designated-initializer as template argument (PR #167159)

[Zhikai Zeng via cfe-commits]

================
@@ -5628,6 +5628,11 @@ class DesignatedInitExpr final
       FieldInfo.NameOrField = reinterpret_cast<uintptr_t>(FD);
     }
 
+    void clearFieldDecl() {
+      assert(isFieldDesignator() && "Only valid on a field designator");
----------------
Backl1ght wrote:

According to the definition, I think this is the only way to clear field decl 
of designator.

https://github.com/llvm/llvm-project/blob/545c3022d28164f5040036a7b515a85f74dbd5cc/clang/include/clang/AST/Expr.h#L5531-L5537

https://github.com/llvm/llvm-project/pull/167159
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