RFR: 8335147: Serial: Refactor TenuredGeneration::promote

Wed Jun 26 08:22:16 UTC 2024

Trivial extracting "copying" logic from old-gen-allocation method to unify the use of `Copy` and `transform_stack_chunk` in young-gc promotion path.

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Commit messages:
 - s1-alloc-promote

Changes: https://git.openjdk.org/jdk/pull/19899/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19899&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335147
  Stats: 21 lines in 3 files changed: 2 ins; 8 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/19899.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19899/head:pull/19899

PR: https://git.openjdk.org/jdk/pull/19899