RFR: 8254274: Development to add 'lint' warning for @ValueBased classes [v3]

[Srikanth Adayapalam]

> New javac lint mode (-Xlint:synchronize) to warn about client side as well JDK internal attempts to synchronize on instances of value based classes

Srikanth Adayapalam has updated the pull request incrementally with one additional commit since the last revision:

  8254274: Messages should refer to value-based classes and not to the internal annotation

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/237/files
  - new: https://git.openjdk.java.net/valhalla/pull/237/files/1a660823..6a6c67ef

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=237&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=237&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/237.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/237/head:pull/237

PR: https://git.openjdk.java.net/valhalla/pull/237