[llvm] [AMDGPU] Improved Lowering of abs(i16) and -abs(i16) (PR #165626)

[Patrick Simmons via llvm-commits]

linuxrocks123 wrote:

Hi @jmmartinez, thanks for reviewing this PR.  Normally I would not have a problem squashing the commits as you suggested, but, in this case, the commit history contains two failed implementation attempts that I would like to preserve during the review process in case a method of fixing one of them is discovered.  Would it be acceptable if I posted the master/branch assemblies of the s_cmp_0.ll testcase instead to facilitate seeing the improvement?

https://github.com/llvm/llvm-project/pull/165626