amdgpu/half_log2: Switch implementation to native_log2

Reviewer: Tom Stellard <tstellar@redhat.com>
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 325060
GitOrigin-RevId: ed28c4458a873d496c66ed87a93e3e8d0da21e20
2 files changed