[clang] [llvm] [ARM][KCFI] Add backend support for Kernel Control-Flow Integrity (PR #163698)

[Kees Cook via cfe-commits]

================
@@ -616,6 +616,35 @@ unsigned ARMBaseInstrInfo::getInstSizeInBytes(const 
MachineInstr &MI) const {
     // contrast to AArch64 instructions which have a default size of 4 bytes 
for
     // example.
     return MCID.getSize();
+  case ARM::KCFI_CHECK: {
----------------
kees wrote:

Oh wow, I totally missed it. Yeah, it's _above_ KCFI_CHECK in both aarch64 and 
riscv. I see it now! :P

https://github.com/llvm/llvm-project/pull/163698
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