[clang] [llvm] [AArch64][PAC] Sign block addresses used in indirectbr. (PR #97647)

[Daniil Kovalev via cfe-commits]

================
@@ -3461,6 +3470,23 @@ bool AArch64InstructionSelector::select(MachineInstr &I) 
{
     return true;
   }
   case TargetOpcode::G_BLOCK_ADDR: {
+    Function *BAFn = I.getOperand(1).getBlockAddress()->getFunction();
+    if (std::optional<uint16_t> BADisc =
+            STI.getPtrAuthBlockAddressDiscriminator(*BAFn)) {
+      MIB.buildInstr(TargetOpcode::IMPLICIT_DEF, {AArch64::X16}, {});
----------------
kovdan01 wrote:

Is there a test which covers this code path?

https://github.com/llvm/llvm-project/pull/97647
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