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* Optimize:Evan Cheng2011-01-051-0/+60
r1025 = s/zext r1024, 4 r1026 = extract_subreg r1025, 4 to: r1026 = copy r1024 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122925 91177308-0d34-0410-b5e6-96231b3b80d8