[lworld] RFR: 8237073: [lworld] Need special handling of jlO constructor invocation

[Srikanth Adayapalam]

Translate new Object() instantiations down to invovations of java.util.Objects.newIdentity() call with an informational message at compie time

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Commit messages:
 - 8237073: [lworld] Need special handling of jlO constructor invocation

Changes: https://git.openjdk.java.net/valhalla/pull/481/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=481&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8237073
  Stats: 63 lines in 38 files changed: 18 ins; 1 del; 44 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/481.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/481/head:pull/481

PR: https://git.openjdk.java.net/valhalla/pull/481