RFR: 8234502: Merge GenCollectedHeap and SerialHeap [v12]

[Lei Zaakjyu]

> 8234502: Merge GenCollectedHeap and SerialHeap

Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:

  restore and rename 'GenCollectedHeap' to 'SerialHeap'

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16927/files
  - new: https://git.openjdk.org/jdk/pull/16927/files/628de1a9..ae2817de

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16927&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16927&range=10-11

  Stats: 64 lines in 2 files changed: 61 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/16927.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16927/head:pull/16927

PR: https://git.openjdk.org/jdk/pull/16927