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

[Simon Pilgrim via llvm-commits]

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@@ -6118,6 +6118,45 @@ bool VectorCombine::foldBitcastOfVPLoad(Instruction &I) {
 ///   bitreverse(bswap(x)) --> bitcast(bitreverse(bitcast(x)))
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RKSimon wrote:

update the comment to show it handles both directions now

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