[InstCombine] matchBSwapOrBitReversem - recognise or(fshl(),fshl()) bswap patterns.
I'm not certain InstCombinerImpl::matchBSwapOrBitReverse needs to filter the or(op0(),op1()) ops - there are just too many cases that recognizeBSwapOrBitReverseIdiom/collectBitParts handle now (and quickly).
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