RFR: 8302068: Serial: Refactor oop closures used in Young GC

Wed Feb 8 12:04:32 UTC 2023

The diff can be a bit hard to follow; it's best to view new code on its own.

Test: tier1-5

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Commit messages:
 - gen-oop

Changes: https://git.openjdk.org/jdk/pull/12471/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12471&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302068
  Stats: 544 lines in 12 files changed: 204 ins; 285 del; 55 mod
  Patch: https://git.openjdk.org/jdk/pull/12471.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12471/head:pull/12471

PR: https://git.openjdk.org/jdk/pull/12471