[clang] [clang][Sema] Diagnose exceptions only in non-dependent context in discarded `try/catch/throw` blocks (PR #139859)

[Erich Keane via cfe-commits]

================
@@ -14384,6 +14386,8 @@ TreeTransform<Derived>::TransformCXXThrowExpr(CXXThrowExpr *E) {
   if (SubExpr.isInvalid())
     return ExprError();
 
+  getSema().DiagnoseExceptionUse(E->getThrowLoc(), /* IsTry */ false);
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erichkeane wrote:

```suggestion
  getSema().DiagnoseExceptionUse(E->getThrowLoc(), /* IsTry=*/ false);
```

https://github.com/llvm/llvm-project/pull/139859