RFR: 8331285: Deprecate and obsolete OldSize [v2]

[Albert Mingkun Yang]

> Simple deprecating a jvm flag.

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 three additional commits since the last revision:

 - merge
 - review
 - old-size

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18994/files
  - new: https://git.openjdk.org/jdk/pull/18994/files/b659f2a5..59741b39

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18994&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18994&range=00-01

  Stats: 1278 lines in 42 files changed: 581 ins; 342 del; 355 mod
  Patch: https://git.openjdk.org/jdk/pull/18994.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18994/head:pull/18994

PR: https://git.openjdk.org/jdk/pull/18994