RFR: 8252182: [JEP 390] Diagnose synchronization on @ValueBased classes [v5]

[Lois Foltan]

> Please review the following changes to add JVM support for @ValueBased class annotation.

Lois Foltan has updated the pull request incrementally with one additional commit since the last revision:

  8252182: [JEP 390] Diagnose synchronization on @ValueBased classes

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/274/files
  - new: https://git.openjdk.java.net/valhalla/pull/274/files/15938b3d..ac5fc322

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=274&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=274&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/274.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/274/head:pull/274

PR: https://git.openjdk.java.net/valhalla/pull/274