[lworld] RFR: 8294860: [lworld] Add java.util.Objects.isValueObject [v2]

[Roger Riggs]

> Add method `java.util.Objects.isValueObject(Object obj)`.
> 
> The complement to `Objects.isIdentityObject(Object obj)` this method return true if the object is a value object.
> 
> Add the cases to the existing ObjectMethods test.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  add link in Objects.isValueObject()

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/786/files
  - new: https://git.openjdk.org/valhalla/pull/786/files/80c6914b..163bca19

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=786&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=786&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/786.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/786/head:pull/786

PR: https://git.openjdk.org/valhalla/pull/786