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Summary: For bitfield insert OR matching, check both operands for larger pattern first before checking for smaller pattern. Add pattern for unsigned bitfield insert-in-zero done with SHL+AND. Resolves PR21631. Reviewers: jmolloy, t.p.northover Subscribers: aemerson, rengolin, llvm-commits, mcrosier Differential Revision: http://reviews.llvm.org/D12908 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248006 91177308-0d34-0410-b5e6-96231b3b80d8
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