[jdk11u-dev] RFR: 8324755: Enable parallelism in vmTestbase/gc/gctests/LargeObjects tests [v2]

[Soumadipta Roy]

> Backporting the fix for https://bugs.openjdk.org/browse/JDK-8324755 merged as part of openjdk/jdk#18798.
> https://github.com/openjdk/jdk/commit/003e86fe38ca1b809418f6282336e259862d0776.patch could be applied cleanly.
> 
> Run details on AL2_x86_64:
> 
> Fastdebug
> before: 1553.74s user 152.18s system 426% cpu 6:39.56 total
> after: 1593.15s user 149.07s system 1610% cpu 1:48.17 total
> 
> Release
> before: 1522.79s user 292.63s system 508% cpu 5:56.78 total
> after: 1579.50s user 246.10s system 2069% cpu 1:28.21 total

Soumadipta Roy has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 003e86fe38ca1b809418f6282336e259862d0776
  
  Backporting the fix for https://bugs.openjdk.org/browse/JDK-8324755
  merged as part of openjdk/jdk#18798.
  https://github.com/openjdk/jdk/commit/003e86fe38ca1b809418f6282336e259862d0776.patch
  could be applied cleanly.
  
  Run details on AL2_x86_64:
  ```
  Fastdebug
  before: 1553.74s user 152.18s system 426% cpu 6:39.56 total
  after: 1593.15s user 149.07s system 1610% cpu 1:48.17 total
  
  Release
  before: 1522.79s user 292.63s system 508% cpu 5:56.78 total
  after: 1579.50s user 246.10s system 2069% cpu 1:28.21 total
  ```

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2762/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2762/files/d7da0784..51916021

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2762&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2762&range=00-01

  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2762.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2762/head:pull/2762

PR: https://git.openjdk.org/jdk11u-dev/pull/2762