Hao Liu fcc897cc45 [MachineCopyPropagation] Fix a bug causing incorrect removal for the instruction sequences as follows
%Q5_Q6<def> = COPY %Q2_Q3
   %D5<def> =
   %D3<def> =
   %D3<def> = COPY %D6     // Incorrectly removed in MachineCopyPropagation
   Using of %D3 results in incorrect result ...

   Reviewed in http://reviews.llvm.org/D8242 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232142 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-13 05:15:23 +00:00
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