[llvm] [AMDGPU] Identify vector idiom to unlock SROA (PR #161200)

[Nikita Popov via llvm-commits]

nikic wrote:

My high level question here is why does this need to be a separate pass rather than integrated in SROA? SROA already has select speculation support. It's currently limited to speculating load/store of select only, but that seems like something that could be generalized? At least the case with CFG modification. (Without CFG modification we need to pick a replacement load/store type.)

https://github.com/llvm/llvm-project/pull/161200