unrolling heuristic per default Benchmarking on x86_64 (thanks Chandler!) and ARM has shown those options speed up some benchmarks while not causing any interesting regressions. llvm-svn: 200621
unrolling heuristic per default Benchmarking on x86_64 (thanks Chandler!) and ARM has shown those options speed up some benchmarks while not causing any interesting regressions. llvm-svn: 200621