RFR: CODETOOLS-7902999: jcstress: Make sure A*FU tests are holding instances in static finals

[Aleksey Shipilev]

A*FU performance depends on the ability to fold the internal checks, which is possible when instances are in "static final". We need to make sure tests do that.

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

Commit messages:
 - CODETOOLS-7902999: jcstress: Make sure A*FU tests are holding instances in static finals

Changes: https://git.openjdk.java.net/jcstress/pull/91/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=91&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902999
  Stats: 225 lines in 3 files changed: 0 ins; 0 del; 225 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/91.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/91/head:pull/91

PR: https://git.openjdk.java.net/jcstress/pull/91