RFR: 8373118: Test java/lang/Thread/virtual/Starvation.java timed out [v36]

[Doug Lea]

> Changes signal filtering to avoid possible starvation

Doug Lea 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 49 additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8373118
 - re-incorporate other improvements
 - For testing: revert to 26 except for redundant signals
 - Revert some layout and sizing, better match spin vs scan
 - Merge branch 'openjdk:master' into JDK-8373118
 - setup for helpJoin
 - Merge branch 'openjdk:master' into JDK-8373118
 - reduce interference after stalls
 - Avoid yield, for performance test
 - Don't oversignal LIFO
 - ... and 39 more: https://git.openjdk.org/jdk/compare/a613b60b...6fc2eb85

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28797/files
  - new: https://git.openjdk.org/jdk/pull/28797/files/dc4cf9e5..6fc2eb85

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28797&range=35
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28797&range=34-35

  Stats: 24499 lines in 543 files changed: 11042 ins; 3337 del; 10120 mod
  Patch: https://git.openjdk.org/jdk/pull/28797.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28797/head:pull/28797

PR: https://git.openjdk.org/jdk/pull/28797