Obsolete OldSize and related code. An internal variable `OldSize` is kept to capture the capacity of old-gen size.
------------- Commit messages: - obsolete-old-size Changes: https://git.openjdk.org/jdk/pull/19647/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19647&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8333962 Stats: 193 lines in 15 files changed: 8 ins; 168 del; 17 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
