[PATCH] [X86] Use ADD/SUB instead of INC/DEC for Haswell and Broadwell CPUs

[Quentin Colombet]

I do not see the relationship between the test case and the feature you are adding.
I would expect the test case to use a Haswell and a Broadwell processor.

Any performance numbers on this change?

Thanks.
-Quentin

http://reviews.llvm.org/D5934