[clang] Upstream support for setjmp & longjmp builtins (PR #178989)

[Chibuoyim Ogbonna via cfe-commits]

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@@ -111,6 +111,39 @@ lowerCIRVisibilityToLLVMVisibility(cir::VisibilityKind visibilityKind) {
   }
 }
 
+// Make sure the LLVM function we are about to create a call for actually
+// exists, if not create one. Returns a function
+void getOrCreateLLVMFuncOp(mlir::ConversionPatternRewriter &rewriter,
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bruteforceboy wrote:

it seems this function is unnecessary upstream. It now makes use of `createLLVMFuncOpIfNotExist` instead.

https://github.com/llvm/llvm-project/pull/178989