[clang] Objective C: use C++ exceptions on MinGW+GNUstep (PR #77255)

[Saleem Abdulrasool via cfe-commits]

================
@@ -2210,7 +2219,11 @@ CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned 
runtimeABIVersion,
 
   // void objc_exception_throw(id);
   ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
-  ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
+  if (usesCxxExceptions) {
+    ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy, IdTy);
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compnerd wrote:

I would say that a ternary to select between the exception model and identify 
the name would be better as you are just selecting the label.

https://github.com/llvm/llvm-project/pull/77255
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