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

[Frederik Carlier via cfe-commits]

================
@@ -156,7 +154,11 @@ static const EHPersonality &getObjCPersonality(const 
TargetInfo &Target,
   case ObjCRuntime::WatchOS:
     return EHPersonality::NeXT_ObjC;
   case ObjCRuntime::GNUstep:
-    if (L.ObjCRuntime.getVersion() >= VersionTuple(1, 7))
+    if (T.isOSCygMing())
----------------
qmfrederik wrote:

I moved the check for `isWindowsMSVCEnvironment` inside the `GNUstep` case, as 
on Windows we'll be using `MSVC_CxxFrameHandler3` when compiling with GNUstep + 
msvc; `GNU_CPlusPlus_SEH` when compiling with GNUstep + mingw and 
`GNU_ObjC_SEH` when compiling iwth GCC + mingw.

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