[jdk8u-dev] RFR: 8337110: [8u] TestNoEagerReclaimOfHumongousRegions.java should be in gc/g1 directory

[Zdenek Zambersky]

`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 executed as part of tier1.

This seems like mistake in JDK-8139424 backport ([orig](https://github.com/openjdk/jdk/commit/6983acfb5f19b4873ec144ad9a38a27c2b0bb402), [8](https://github.com/openjdk/jdk8u-dev/commit/baf5076889f3e5b4c535e1a25f00eb629de15770)). Hotspot code uses dir named `gc_implementation` instead of `gc` on 8, but this is not the case for tests.

This change moves `TestNoEagerReclaimOfHumongousRegions.java` hotspot test from  `gc_implementation/g1` -> `gc/g1`.

Testing:
tier1: OK (After this change test newly executes as part of tier1 and passes on all systems. Failures of other tests are unrelated.)

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Commit messages:
 - Move TestNoEagerReclaimOfHumongousRegions.java to gc group

Changes: https://git.openjdk.org/jdk8u-dev/pull/551/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=551&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337110
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/551.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/551/head:pull/551

PR: https://git.openjdk.org/jdk8u-dev/pull/551