RFR: 8367507: Parallel: Remove PSPromotionManager::drain_stacks_depth [v2]

[Albert Mingkun Yang]

> Trivial renaming a method so that we can remove one of two methods with identical implementations, `drain_stacks` and `drain_stacks_depth`.
> 
> Test: tier1

Albert Mingkun Yang 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 two additional commits since the last revision:

 - Merge branch 'master' into pgc-stack-merge
 - pgc-stack-merge

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27252/files
  - new: https://git.openjdk.org/jdk/pull/27252/files/572e1c43..6ff01cad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27252&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27252&range=00-01

  Stats: 4 lines in 2 files changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27252.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27252/head:pull/27252

PR: https://git.openjdk.org/jdk/pull/27252