Updates test case verifying codegen for intenum literal args.

    - Allows expected regex to match even when "nonnull" qualifier
      was not found on retval pointer argument of a function call.

numba_dpex/tests/codegen/test_intenum_literal_codegen.py

@@ -47,7 +47,7 @@ def pass_flags_to_func(a):
 
     pattern = re.compile(
         r"call spir_func i32 @\_Z.*bitwise\_or"
-        r"\_flags.*\(i64\* nonnull %.*, i64 1, i64 2\)"
+        r"\_flags.*\(i64\*\s(\w+)?\s*%.*, i64 1, i64 2\)"
     )
 
     assert re.search(pattern, llvm_ir_mod) is not None