RFR: 8290379: Parse error with parenthesized pattern and guard using an array

[Aggelos Biboudis]

8290379: Parse error with parenthesized pattern and guard using an array

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Commit messages:
 - 8290379: Parse error with parenthesized pattern and guard using an array

Changes: https://git.openjdk.org/jdk/pull/9519/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9519&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290379
  Stats: 56 lines in 2 files changed: 55 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9519.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9519/head:pull/9519

PR: https://git.openjdk.org/jdk/pull/9519