[NFC][LV] Fix what seems to be a typo in the test (#187769)
The test was added in
https://github.com/llvm/llvm-project/commit/4e9894498e166ef6b207c25e780db0b6f006cc89.
Alternative fixes would be:
* Remove unused GEP, although not clear why we'd want to overwrite
stored `i64` with `ptr` store.
* Keep this patch, but perform both GEPs with `i64` element type to
reduce the diff. It's not clear if the scalarization caused by that type
mismatch is intentional/relevant for the original change.
llvm-project
a9ae2fd7 - [NFC][LV] Fix what seems to be a typo in the test (#187769)
