radv: port to use common passmgr code.

This adds a inline always pass, but otherwise should work the
same.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/common/ac_llvm_util.c

@@ -172,8 +172,9 @@ LLVMPassManagerRef ac_create_passmgr(LLVMTargetLibraryInfoRef target_library_inf
 	if (!passmgr)
 		return NULL;
 
-	LLVMAddTargetLibraryInfo(target_library_info,
-				 passmgr);
+	if (target_library_info)
+		LLVMAddTargetLibraryInfo(target_library_info,
+					 passmgr);
 
 	if (check_ir)
 		LLVMAddVerifierPass(passmgr);