[clang] [llvm] [X86] Extend kCFI with a 3-bit arity indicator (PR #121070)

[Scott Constable via cfe-commits]

================
@@ -181,8 +181,26 @@ void X86AsmPrinter::emitKCFITypeId(const MachineFunction 
&MF) {
   // Embed the type hash in the X86::MOV32ri instruction to avoid special
   // casing object file parsers.
   EmitKCFITypePadding(MF);
+
+  Register MovReg = X86::EAX;
+  const auto &Triple = MF.getTarget().getTargetTriple();
+  if (Triple.isArch64Bit() && Triple.isOSLinux()) {
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scottconstable wrote:

@phoebewang Good suggestion! I updated the PR to use an assert.

https://github.com/llvm/llvm-project/pull/121070
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