[lworld] RFR: 8286491: Withdraw ValueObject and IdentityObject and introduce value and identity class modifiers

[Srikanth Adayapalam]

Changes to javac, hotspot runtime, core libs and asmtools sources and tests

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Commit messages:
 - 8286491: Withdraw ValueObject and IdentityObject and introduce value and identity class modifiers

Changes: https://git.openjdk.java.net/valhalla/pull/688/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=688&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286491
  Stats: 1044 lines in 80 files changed: 151 ins; 664 del; 229 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/688.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/688/head:pull/688

PR: https://git.openjdk.java.net/valhalla/pull/688