Unit tests: Convert the refcnttest unit test to use the new EXPECT macros.
Unit tests: Convert the refcnttest unit test to use the new EXPECT macros.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin