[PATCH] [AArch64] Lower sdiv x, pow2 using add + select + shift.

[Chad Rosier]

>>! In D4438#14, @grosbach wrote:
> Are there improvements other than on EEMBC? We don't have access to that suite.

I saw not regressions or improvements in SPEC2K.  Unfortunately, I can't run SPEC2K6 on our devices.  Our infrastructure also doesn't support the llvm/test-suite.

I can create a synthetic benchmark, if that helps.

http://reviews.llvm.org/D4438