[lworld] Integrated: 8267821: [lworld] Javac's handling of `primitive' modifier is unlike the handling of other restricted identifiers

[Srikanth Adayapalam]

Harmonize handling of `primitive' modifier along the lines of other reserved type identifiers.

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Commit messages:
 - 8267821: Javac's handling of `primitive' modifier is unlike the handling of other restricted identifiers

Changes: https://git.openjdk.java.net/valhalla/pull/449/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=449&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267821
  Stats: 134 lines in 8 files changed: 60 ins; 73 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/449.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/449/head:pull/449

PR: https://git.openjdk.java.net/valhalla/pull/449