Clarify that we match BSwap in InstCombine and BitReverse in CGP. NFC.

Also, rename recognizeBitReverseOrBSwapIdiom to recognizeBSwapOrBitReverseIdiom,
so the ordering of the MatchBSwaps and MatchBitReversals arguments are
consistent with the function name.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270715 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed