RFR: 8333962: Obsolete OldSize [v3]

[Albert Mingkun Yang]

> Obsolete OldSize and related code. An internal variable `OldSize` is kept to capture the capacity of old-gen size.

Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  obsolete-old-size

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19647/files
  - new: https://git.openjdk.org/jdk/pull/19647/files/3e820b6f..a27f5172

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19647&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19647&range=01-02

  Stats: 1483 lines in 67 files changed: 966 ins; 310 del; 207 mod
  Patch: https://git.openjdk.org/jdk/pull/19647.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19647/head:pull/19647

PR: https://git.openjdk.org/jdk/pull/19647