[lworld] RFR: 8248251 don't all java.lang.IdentityObject to be redefined or retrans…

[Harold Seigel]

Add check to prevent interface java.lang.IdentityObject from being redefined or retransformed.  And, add test case.

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Commit messages:
 - 8248251 don't all java.lang.IdentityObject to be redefined or retransformed

Changes: https://git.openjdk.java.net/valhalla/pull/101/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/101/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248251
  Stats: 10 lines in 2 files changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/101.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/101/head:pull/101

PR: https://git.openjdk.java.net/valhalla/pull/101