[llvm] [hwasan] Add intrinsics for fixed shadow on Aarch64 (PR #89319)

[Thurston Dang via llvm-commits]

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@@ -551,8 +553,18 @@ void AArch64AsmPrinter::LowerKCFI_CHECK(const MachineInstr &MI) {
 void AArch64AsmPrinter::LowerHWASAN_CHECK_MEMACCESS(const MachineInstr &MI) {
   Register Reg = MI.getOperand(0).getReg();
   bool IsShort =
-      MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES;
+      ((MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES) ||
+       (MI.getOpcode() ==
+        AArch64::HWASAN_CHECK_MEMACCESS_SHORTGRANULES_FIXEDSHADOW));
   uint32_t AccessInfo = MI.getOperand(1).getImm();
+
+  if ((MI.getOpcode() == AArch64::HWASAN_CHECK_MEMACCESS_FIXEDSHADOW) ||
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thurstond wrote:

> optional: we can make this the condition for L641 below, that would maybe be a bit less indirect?

Done 

> getFixedShadowBase().value_or(0) as fallback is LGTM

Done.

Thanks Florian and Vitaly!

https://github.com/llvm/llvm-project/pull/89319