[llvm] [AArch64][BTI] Mark EH landing pads as jump targets (PR #149680)

[Benjamin Herrenschmidt via llvm-commits]

ozbenh wrote:

So I tested a quick backport to llvm15 (default on AL2023) and it didn't work:
```
+--- a/llvm/lib/Target/AArch64/AArch64BranchTargets.cpp
++++ b/llvm/lib/Target/AArch64/AArch64BranchTargets.cpp
+@@ -91,7 +91,7 @@ bool AArch64BranchTargets::runOnMachineFunction(MachineFunction &MF) {
+ 
+     // If the block itself is address-taken, it could be indirectly branched
+     // to, but not called.
+-    if (MBB.hasAddressTaken() || JumpTableTargets.count(&MBB))
++    if (MBB.hasAddressTaken() || JumpTableTargets.count(&MBB) || MBB.isEHPad())
+       CouldJump = true;
+ 
+     if (CouldCall || CouldJump) {
```
That said I might have made a mistake, juggling too many plates today. I'll test on Fedora's llvm20 asap and check llvm15 again & will report.


https://github.com/llvm/llvm-project/pull/149680