[libomptarget][amdgcn] Implement get_wtime
as a scaled call to an intrinsic. Implementation identical to that in aomp.
JonChesterfield on Mar 3 2020, 4:07 PM.Authored by
I'm unable to find a good reference for what this frequency should be, so am considering unconditionally returning zero from this function. That won't 'work' in any useful sense, but it's an improvement on failing to link because __clock64 is undefined.