amdgpu: Add workaround for unimplemented llvm.exp intrinsic

Reviewer: Jeroen Ketema
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 317935
GitOrigin-RevId: 8dc6e98d4733456e54557d66d75c4691c195ac65
3 files changed