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Summary: * Add a bitreverse case in the demanded bits analysis pass. * Add tests for the bitreverse (and bswap) intrinsic in the demanded bits pass. * Add a test case to the BDCE tests: that manipulations to high-order bits are eliminated once the bits are reversed and then right-shifted. Reviewers: mkuper, jmolloy, hfinkel, trentxintong Reviewed By: jmolloy Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31857 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300215 91177308-0d34-0410-b5e6-96231b3b80d8