RFR: 8306474: Move InstanceKlass read-only flags [v2]

[Coleen Phillimore]

> Moved three read-only InstanceKlass flags out of AccessFlags to InstanceKlassFlags, and removed unused and unneeded SA code.
> Tested with tier1-4.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  John's suggestion

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13545/files
  - new: https://git.openjdk.org/jdk/pull/13545/files/eb1e4139..066798c2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13545&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13545&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13545.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13545/head:pull/13545

PR: https://git.openjdk.org/jdk/pull/13545