[clang] [llvm] [X86] support reserve r8~r15 on X86_64 (PR #180242)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp,h -- clang/test/Driver/x86_64-fixed-r-register.c clang/lib/Basic/Targets/X86.h clang/lib/Driver/ToolChains/Arch/X86.cpp llvm/lib/Target/X86/X86FrameLowering.cpp llvm/lib/Target/X86/X86ISelLowering.cpp llvm/lib/Target/X86/X86RegisterInfo.cpp llvm/lib/Target/X86/X86Subtarget.cpp llvm/lib/Target/X86/X86Subtarget.h --diff_from_common_commit
``````````

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changing `origin/main` to the base branch/commit you want to compare against.
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``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 532976d0f..ebf609584 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -28741,7 +28741,7 @@ Register X86TargetLowering::getRegisterByName(const char* RegName, LLT VT,
     Reg = MatchRegisterName(RegName);
     if (!Subtarget.isRegisterReservedByUser(Reg))
       reportFatalUsageError(Twine("Trying to obtain non-reserved register \"" +
-                            StringRef(RegName) + "\"."));
+                                  StringRef(RegName) + "\"."));
   }
 
   return Reg;

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https://github.com/llvm/llvm-project/pull/180242