RFR: 8368104: Parallel: Refactor PSThreadRootsTaskClosure [v2]

[Albert Mingkun Yang]

> Trivial changing the closure input arg to avoid `PSPromotionManager` lookup.
> 
> Test: tier1

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

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27393/files
  - new: https://git.openjdk.org/jdk/pull/27393/files/b14386f3..476c3cce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27393&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27393&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27393.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27393/head:pull/27393

PR: https://git.openjdk.org/jdk/pull/27393