[llvm] Revert "[SLP]Improve/fix subvectors in gather/buildvector nodes handling" (PR #105780)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Confirmed that it is caused by SLP vectorizer.
See https://github.com/llvm/llvm-project/issues/105783.


https://github.com/llvm/llvm-project/pull/105780