RFR: 8364877: G1: Inline G1CollectedHeap::set_region_short_lived_locked

[Thomas Schatzl]

Hi all,

  please review this change that inlines `G1CollectedHeap::set_region_short_lived_locked` - it's very small, and used only once in the same class, and has a very unusual name.

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - 8364877

Changes: https://git.openjdk.org/jdk/pull/26663/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26663&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364877
  Stats: 15 lines in 4 files changed: 4 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/26663.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26663/head:pull/26663

PR: https://git.openjdk.org/jdk/pull/26663