In the IdentityHashMap class javadoc elaborate the meaning and use of `==` sameness meaning indistinguishable.
------------- Commit messages: - 8293280: [lworld] IdentityHashmap spec when key is a Value class Changes: https://git.openjdk.org/valhalla/pull/2251/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2251&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8293280 Stats: 21 lines in 1 file changed: 8 ins; 0 del; 13 mod Patch: https://git.openjdk.org/valhalla/pull/2251.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2251/head:pull/2251 PR: https://git.openjdk.org/valhalla/pull/2251
