[llvm] [SROA] Prevent load atomic vector from being generated (PR #112432)

[via llvm-commits]

jofrn wrote:

This is a follow-up to https://github.com/llvm/llvm-project/pull/111414, which used -disable-verify. This commit prevents atomic load vector at all.

https://github.com/llvm/llvm-project/pull/112432