[lworld] RFR: 8279839 [lworld] Javac has started incorrectly accepting native as a modifer for classes

[Jesper Steen Møller]

Confusion between the ACC_VALUE and ACC_NATIVE resolved
by making explicit class flags masks for the adjusted flags.

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Commit messages:
 - Stray whitespace
 - 8279839 [lworld] Javac has started incorrectly accepting native as a modifer for classes

Changes: https://git.openjdk.java.net/valhalla/pull/627/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=627&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279839
  Stats: 21 lines in 5 files changed: 17 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/627.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/627/head:pull/627

PR: https://git.openjdk.java.net/valhalla/pull/627