[clang] [CIR][NFC] Upstream EHPersonality for function (PR #164883)

[Amr Hesham via cfe-commits]

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@@ -257,5 +258,53 @@ inline void EHScopeStack::popCatch() {
   deallocate(EHCatchScope::getSizeForNumHandlers(scope.getNumHandlers()));
 }
 
+/// The exceptions personality for a function.
+struct EHPersonality {
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AmrDeveloper wrote:

Sure, I will do that 🫡

https://github.com/llvm/llvm-project/pull/164883