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Author SHA1 Message Date
Hao Liu 04183242b3 [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 

llvm-svn: 232142
 2015-03-13 05:15:23 +00:00