[llvm] [Hexagon] Fix hexagon-copy-hoisting.mir (PR #90740)

[via llvm-commits]

================
@@ -11,23 +11,19 @@
 
 ---
 name:            f0
-tracksRegLiveness: true
+tracksRegLiveness: false
----------------
mikaelholmen wrote:

So if it's on when you run -stop-before, maybe the pass should deal with liveness?

The pass even does
```
  // Re-compute liveness
  if (Changed) {
    LiveIntervals &LIS = getAnalysis<LiveIntervals>();
    SlotIndexes *SI = LIS.getSlotIndexes();
    SI->releaseMemory();
    SI->runOnMachineFunction(Fn);
    LIS.releaseMemory();
    LIS.runOnMachineFunction(Fn);
  }
```
Yet, liveness is broken after the pass?

Why do you (try to) recompute liveness if liveness shouldn't be tracked? And why is liveness then still broken after the pass. Something doesn't look right here.


https://github.com/llvm/llvm-project/pull/90740