[clang] [clang] Handle CC attrs for UEFI (PR #138935)

[Prabhu Rajasekaran via cfe-commits]

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@@ -581,8 +581,11 @@ CodeGenTypes::arrangeObjCMessageSendSignature(const ObjCMethodDecl *MD,
   }
 
   FunctionType::ExtInfo einfo;
-  bool IsWindows = getContext().getTargetInfo().getTriple().isOSWindows();
-  einfo = einfo.withCallingConv(getCallingConventionForDecl(MD, IsWindows));
+  bool IsTargetDefaultMSABI =
+      getContext().getTargetInfo().getTriple().isOSWindows() ||
+      getContext().getTargetInfo().getTriple().isUEFI();
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Prabhuk wrote:

I had introduced isOSWindowsOrUEFI upstream for cases like these. But just landed a change to drop `Triple::isOSWindowsOrUEFI()` upstream based on review feedback. It's not there anymore. 

https://github.com/llvm/llvm-project/pull/138935