RFR: 8324970: Serial: Refactor signature of maintain_old_to_young_invariant [v2]

[Albert Mingkun Yang]

> Trivial type-change in signature.

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/17631/files
  - new: https://git.openjdk.org/jdk/pull/17631/files/6406e337..0b1a372b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17631&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17631&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17631/head:pull/17631

PR: https://git.openjdk.org/jdk/pull/17631