[clang] [clang] Fix UEFI Target info (PR #127290)

[Tristan Ross via cfe-commits]

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@@ -835,16 +835,22 @@ class LLVM_LIBRARY_VISIBILITY UEFIX86_64TargetInfo
 public:
   UEFIX86_64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
       : UEFITargetInfo<X86_64TargetInfo>(Triple, Opts) {
+    LongWidth = LongAlign = 32;
+    DoubleAlign = LongLongAlign = 64;
+    IntMaxType = SignedLongLong;
+    Int64Type = SignedLongLong;
+    SizeType = UnsignedLongLong;
+    PtrDiffType = SignedLongLong;
+    IntPtrType = SignedLongLong;
+    LongDoubleWidth = LongDoubleAlign = 64;
+    LongDoubleFormat = &llvm::APFloat::IEEEdouble();
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RossComputerGuy wrote:

I've asked someone who does work quite often with EFI stuff and they don't know either. It sounds like it's up to the developer to handle it. It's possible it's not even allowed.

https://github.com/llvm/llvm-project/pull/127290