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

[via llvm-commits]

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

```
Recomputing the liveness is important for other passes further down the line
```
Yeah that's why I thought it's no good if liveness is still broken after the pass? Which the verifier said?

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