[lworld] RFR: 8281463: [lworld] VALUE / PRIMITIVE modifiers should be supported by reflection

[Roger Riggs]

Add support to java.lang.reflect.AccessFlag ACC_IDENTITY, ACC_VALUE, and ACC_PRIMITIVE.
Added corresponding flags to j.l.reflect.Modifier so the "source" of the AccessFlag is the Modifer mask.
Remove PERMITS_VALUE; moving the definition used by HotSpot to HotSpot code.

Add comments to java.l.reflect.Modifier suggesting use of AccessFlag instead and limitations.

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Commit messages:
 - 8281463: [lworld] VALUE / PRIMITIVE modifiers should be supported by reflection

Changes: https://git.openjdk.java.net/valhalla/pull/698/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=698&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281463
  Stats: 84 lines in 5 files changed: 51 ins; 13 del; 20 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/698.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/698/head:pull/698

PR: https://git.openjdk.java.net/valhalla/pull/698