I have been looking at hotspot:tier4 (catch-all not in lower tiers) run logs, and realized the whole bunch of compiler tests are running there.

Since hotspot:tier4 runs a lot of vmTestbase tests, contributors seldom run it, as it takes many hours. Which means that many compiler tests are not running regularly for many contributors. But these tests are rather fast themselves and cover important compiler features.

We can properly add compiler tests to tier{2,3} to expose them on earlier tiers.