[llvm] ValueTracking: Allow getUnderlyingObject to look at vectors (PR #114311)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Nov 6, 8:13 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/114311).


https://github.com/llvm/llvm-project/pull/114311