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

[Phoebe Wang via llvm-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()) {
----------------
phoebewang wrote:

You can use assert to guarantee it won't be broken in the future.

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