[llvm] [clang] [IR] Fix GEP offset computations for vector GEPs (PR #75448)

[Jannik Silvanus via cfe-commits]

jasilvanus wrote:

Interesting, here it is online: https://alive2.llvm.org/ce/z/Bm5gP2
The complaint goes away if `half` is naturally aligned (`f16:16`).

Looks like an Alive2 bug with respect to vector bit layout? 



https://github.com/llvm/llvm-project/pull/75448