RFR: 8336463: Parallel: Add PSOldGen::expand_and_allocate [v2]

[Albert Mingkun Yang]

> Simple adding an API to old-gen to support calls by VM thread in safepoint.
> 
> Test: tier1-3

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20189/files
  - new: https://git.openjdk.org/jdk/pull/20189/files/52782508..cfa6475c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20189&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20189&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20189.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20189/head:pull/20189

PR: https://git.openjdk.org/jdk/pull/20189