[PATCH] D10950: [SLPVectorizer] Try different vectorization factors and set max vector register size based on target

[Sanjay Patel]

spatel added a reviewer: tstellarAMD.

Adding Tom: 
I'd prefer not to have to XFAIL the AMDGPU test. Can you provide some guidance about what the expected behavior should be there? Thanks!


http://reviews.llvm.org/D10950