RFR: 8353596: GenShen: Test TestClone.java#generational-no-coops intermittent timed out

[William Kemper]

We've identified another scenario that could result in intermittent timeout failures in jtreg tests. If the cause of the gc cycle is `GCCause::_codecache_GC_threshold`, the thread requesting the GC will not be notified.

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Commit messages:
 - Notify gc waiter and alloc failure waiters when a gc completes successfully

Changes: https://git.openjdk.org/jdk/pull/24834/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353596
  Stats: 7 lines in 1 file changed: 1 ins; 5 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24834.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24834/head:pull/24834

PR: https://git.openjdk.org/jdk/pull/24834