[lworld] RFR: 8338698: [lworld] ObjectStreamClass should throw InstantiationException for abstract value class

[Roger Riggs]

Updated ObjectStreamClass creation of newValueInstance to throw InstantiationException if the class is abstract or identity class.

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Commit messages:
 - 8338698: [lworld] ObjectStreamClass should throw InstantiationException for abstract value class

Changes: https://git.openjdk.org/valhalla/pull/1215/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1215&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338698
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1215.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1215/head:pull/1215

PR: https://git.openjdk.org/valhalla/pull/1215