RFR: 8307533: Use atomic bitset functions for metadata flags [v2]

[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 incrementally with one additional commit since the last revision:

  remove extra variables in favor of casts to help the template.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13843/files
  - new: https://git.openjdk.org/jdk/pull/13843/files/7009b524..91de5aa4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13843&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13843&range=00-01

  Stats: 4 lines in 3 files changed: 0 ins; 1 del; 3 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