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[APInt] Remove calls to clearUnusedBits from XorSlowCase and operator^=
Summary: There's a comment in XorSlowCase that says "0^0==1" which isn't true. 0 xored with 0 is still 0. So I don't think we need to clear any unused bits here. Now there is no difference between XorSlowCase and AndSlowCase/OrSlowCase other than the operation being performed Reviewers: majnemer, MatzeB, chandlerc, bkramer Reviewed By: MatzeB Subscribers: chfast, llvm-commits Differential Revision: https://reviews.llvm.org/D28986 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292873 91177308-0d34-0410-b5e6-96231b3b80d8
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