RFR: 8307533: Use atomic bitset functions for metadata flags [v3]

[Coleen Phillimore]

> Replace the bit set copies from metadata to use the Atomic functions.
> Tested with tier1-4.

Coleen Phillimore 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 branch 'master' into bit-set
 - remove extra variables in favor of casts to help the template.
 - 8307533: Use atomic bitset functions for metadata flags

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13843/files
  - new: https://git.openjdk.org/jdk/pull/13843/files/91de5aa4..9c53bfe6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13843&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13843&range=01-02

  Stats: 112140 lines in 1883 files changed: 89187 ins; 9226 del; 13727 mod
  Patch: https://git.openjdk.org/jdk/pull/13843.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13843/head:pull/13843

PR: https://git.openjdk.org/jdk/pull/13843