[llvm] [Transforms] Resolve FIXME: Pick the smallest legal type that fits (PR #79158)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

Also:
```
[Transforms] pre-commit tests (NFC)

Add multiple runs instead of just one, so we can see the differences in IR transformations.
```
is not a good commit message. Tests for *what*? And since this is not a stacked pull request the first commit will get lost when squashing.

https://github.com/llvm/llvm-project/pull/79158