TestNoEagerReclaimOfHumongousRegions.java is placed (as the only test) in gc_implementation/g1 directory instead of gc/g1, where similar tests are placed. As a result test is not part of any test group and is currently not exectuted as part of tier1.

This seems like mistake in JDK-8139424 backport. Hotspot code uses dir named `gc_implementation` instead of `gc` on 8, but this is not the case for tests.