[InstCombine] fix formatting for matchBSwap(); NFC

We should have a similar function for matching rotate and/or 
funnel shift, so tidy up the related existing call.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346871 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed