RFR: 8272838: Move CriticalJNI tests out of tier1 [v2]

[Aleksey Shipilev]

> See the bug report for more discussion. These tests are tied in Epsilon and Shenandoah test groups, so I rehashed those a bit. Note there are no `tier2` or `tier3` test groups in Hotspot yet, which means these tests would only run as part of Epsilon and Shenandoah test suites. I would rehash tier2/3 in [JDK-8272914](https://bugs.openjdk.java.net/browse/JDK-8272914), while hooking up more runtime and GC tests there.
> 
> Motivational run time improvements:
> 
> 
> $  make run-test TEST=hotspot:tier1
> 
> # Before
> real	8m9.678s
> user	289m59.304s
> sys	27m46.347s
> 
> # After
> real	7m53.359s    # 15 seconds saved
> user	278m49.104s  # 11 minutes saved
> sys	28m2.516s
> 
> 
> Additional testing:
>  - [x] Checked `hotspot:tier1` run test lists before/after the patch, the difference is only these two lists
>  - [x] Some test performance measurements.

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Make sure CriticalJNI tests are in tier2 in both Epsilon and Shenandoah blocks
 - Merge branch 'master' into JDK-8272838-perf-test-criticaljni
 - 8272838: Remove CriticalJNI tests from tier1

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5219/files
  - new: https://git.openjdk.java.net/jdk/pull/5219/files/a9556d7a..8c628bf4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5219&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5219&range=00-01

  Stats: 7100 lines in 339 files changed: 4941 ins; 1108 del; 1051 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5219.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5219/head:pull/5219

PR: https://git.openjdk.java.net/jdk/pull/5219