[PATCH] PR20234 - [SLP Vectorizer] Canonicalize operands of commutitive binary operands.

[Nadav Rotem]

Chad, 

In this patch you are changing the instruction V regardless if vectorization succeeds or not. Would it be possible to only change the VL vector without modifying the binary operator V?  

Thanks,
Nadav

http://reviews.llvm.org/D4680