[lworld] RFR: 8279838: [lworld] PrimitiveObject is dead, long live ValueObject

[Srikanth Adayapalam]

Javac, hotspot and jdk changes to cope with PrimitiveObject in its new avatar as ValueObject

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Commit messages:
 - 8279838: PrimitiveObject is dead, long live ValueObject

Changes: https://git.openjdk.java.net/valhalla/pull/599/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=599&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279838
  Stats: 199 lines in 25 files changed: 68 ins; 66 del; 65 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/599.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/599/head:pull/599

PR: https://git.openjdk.java.net/valhalla/pull/599