[llvm] [VectorCombine] Fold bitcast(bitreverse.v8i8(bitcast(IntTy))) into bswap+bitreverse (PR #209037)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

please avoid using rebase unless you REALLY need to - it corrupts the review comment history

https://github.com/llvm/llvm-project/pull/209037