[lworld] RFR: 8326707: [lworld] Remove VALUE modifier from Modifier and AccessFlag

[Roger Riggs]

Remove the VALUE modifier in Modifier.java and AccessFlag.java.
Map the Class.isValue() method to `!Class.isIdentity()`.

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Commit messages:
 - 8326707: [lworld] Remove VALUE modifier from Modifier and AccessFlag

Changes: https://git.openjdk.org/valhalla/pull/1019/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1019&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326707
  Stats: 34 lines in 4 files changed: 0 ins; 23 del; 11 mod
  Patch: https://git.openjdk.org/valhalla/pull/1019.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1019/head:pull/1019

PR: https://git.openjdk.org/valhalla/pull/1019