[clang] [clang][Sema] Improve template argument deduction diagnostic (PR #122754)

[Justin Fargnoli via cfe-commits]

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@@ -11610,9 +11618,11 @@ static void DiagnoseBadDeduction(Sema &S, NamedDecl *Found, Decl *Templated,
                                  bool TakingCandidateAddress) {
   TemplateParameter Param = DeductionFailure.getTemplateParameter();
   NamedDecl *ParamD;
-  (ParamD = Param.dyn_cast<TemplateTypeParmDecl*>()) ||
-  (ParamD = Param.dyn_cast<NonTypeTemplateParmDecl*>()) ||
-  (ParamD = Param.dyn_cast<TemplateTemplateParmDecl*>());
+
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justinfargnoli wrote:

```suggestion
```

https://github.com/llvm/llvm-project/pull/122754