RFR: 8324240: Remove unused GrowableArrayView::EMPTY

[Kim Barrett]

Please review this trivial change to remove an unused variable.

The variable was introduced by [JDK-8254231](https://bugs.openjdk.org/browse/JDK-8254231). All uses were removed by [JDK-8283689](https://bugs.openjdk.org/browse/JDK-8283689).

Testing: mach5 tier1

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Commit messages:
 - remove unused variable

Changes: https://git.openjdk.org/jdk/pull/17507/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17507&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324240
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17507.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17507/head:pull/17507

PR: https://git.openjdk.org/jdk/pull/17507