[lworld] RFR: 8368078: [lworld] tools/javac/flags/ExtendedStandardFlagsOverlayFlagsConflict.java fails with Valhalla

[Vicente Romero]

adjusting flags so that flag VALUE_CLASS doesn't class with any other flag

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Commit messages:
 - 8368078: [lworld] tools/javac/flags/ExtendedStandardFlagsOverlayFlagsConflict.java fails with Valhalla

Changes: https://git.openjdk.org/valhalla/pull/1624/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1624&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368078
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1624.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1624/head:pull/1624

PR: https://git.openjdk.org/valhalla/pull/1624