[lworld] RFR: 8280979: [lworld] Rename PrimitiveObjectMethods to ValueObjectMethods [v3]

[Mandy Chung]

> This PR does the renaming to match the Value Objects JEP.

Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:

  clean up references to value type

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/787/files
  - new: https://git.openjdk.org/valhalla/pull/787/files/1d6ab603..319b0069

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=787&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=787&range=01-02

  Stats: 31 lines in 1 file changed: 7 ins; 10 del; 14 mod
  Patch: https://git.openjdk.org/valhalla/pull/787.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/787/head:pull/787

PR: https://git.openjdk.org/valhalla/pull/787