[llvm] r232142 - [MachineCopyPropagation] Fix a bug causing incorrect removal for the instruction sequences as follows

[Joerg Sonnenberger]

On Fri, Mar 13, 2015 at 05:15:23AM -0000, Hao Liu wrote:
> Author: haoliu
> Date: Fri Mar 13 00:15:23 2015
> New Revision: 232142
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=232142&view=rev
> Log:
> [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 

Is this relevant for the 3.6 branch?

Joerg