radv/ac: copy llvm machine feature flags from radeonsi.

This just updates this to use the same flags as radeonsi
for consistency.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/amd/common/ac_llvm_util.c

@@ -131,7 +131,7 @@ LLVMTargetMachineRef ac_create_target_machine(enum radeon_family family, bool su
 	                             target,
 	                             triple,
 	                             ac_get_llvm_processor_name(family),
-	                             "+DumpCode,+vgpr-spilling",
+	                             "+DumpCode,+vgpr-spilling,-fp32-denormals,-xnack",
 	                             LLVMCodeGenLevelDefault,
 	                             LLVMRelocDefault,
 	                             LLVMCodeModelDefault);