[llvm] [AArch64] Fix active.lane.mask(0, cttz.elts(x)) -> 'brkb' transform (PR #180177)

[Paul Walker via llvm-commits]

================
@@ -48,6 +48,10 @@ void AArch64SelectionDAGInfo::verifyTargetNode(const SelectionDAG &DAG,
 #ifndef NDEBUG
   // Some additional checks not yet implemented by verifyTargetNode.
   switch (N->getOpcode()) {
+  case AArch64ISD::CTTZ_ELTS:
+    assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
+           "Expected the mask and general-predicate have matching types");
----------------
paulwalker-arm wrote:

```suggestion
           "Expected the mask and general-predicate to have matching types");
```
Might also be worth swapping to "general-predicate and mask" to reflect the operand order.

https://github.com/llvm/llvm-project/pull/180177