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[InstCombine] canonicalize rotate right by constant to rotate left
This was noted as a backend problem: https://bugs.llvm.org/show_bug.cgi?id=41057 ...and subsequently fixed for x86: rL356121 But we should canonicalize these in IR for the benefit of all targets and improve IR analysis such as CSE. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356338 91177308-0d34-0410-b5e6-96231b3b80d8
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