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r225135 added the ability to materialize i64 constants using rotations in order to reduce the instruction count. Sometimes we can use a rotation only with some extra masking, so that we take advantage of the fact that generating a bunch of extra higher-order 1 bits is easy using li/lis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225147 91177308-0d34-0410-b5e6-96231b3b80d8