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

[Erich Keane via cfe-commits]

================
@@ -853,10 +853,9 @@ ExprResult Sema::BuildCXXThrow(SourceLocation OpLoc, Expr 
*Ex,
       getLangOpts().OpenMPIsTargetDevice && (T.isNVPTX() || T.isAMDGCN());
   // Don't report an error if 'throw' is used in system headers or in an OpenMP
   // target region compiled for a GPU architecture.
-  if (!IsOpenMPGPUTarget && !getLangOpts().CXXExceptions &&
-      !getSourceManager().isInSystemHeader(OpLoc) && !getLangOpts().CUDA) {
+  if (!IsOpenMPGPUTarget && !getLangOpts().CUDA) {
     // Delay error emission for the OpenMP device code.
-    targetDiag(OpLoc, diag::err_exceptions_disabled) << "throw";
+    DiagnoseExceptionUse(OpLoc, /* IsTry */ false);
----------------
erichkeane wrote:

```suggestion
    DiagnoseExceptionUse(OpLoc, /* IsTry= */ false);
```

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