[AArch64] -fomit-frame-pointer testing and enabling by default on Linux

Hi All,

I recently completed a series of changes (final one: r262495) that enable –fomit-frame-pointer to work for non-leaf functions on aarch64 targets. I have done llvm-testsuite and SPEC and other benchmark correctness testing, but I’d appreciate any further testing people could do with their out of tree test suites/applications using this flag. Assuming all the kinks get worked out, I’d then like to propose we enable this flag by default when optimizing on aarch64 Linux targets (as is currently done for other Linux targets).


I think this is a good idea.