RFR: 8314734: Remove unused field TypeVariableImpl.EMPTY_ANNOTATION_ARRAY

[Andrey Turbanov]

Field is unused since [JDK-8004698](https://bugs.openjdk.org/browse/JDK-8004698) - https://github.com/openjdk/jdk/commit/b29b4794613a2aca125c2a6e9f8ed1d0f01a4ce2#diff-2b6035b7134d61a89cfee1ad7bdc1bf21ce37421358375d6399de950c17c0c8e

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Commit messages:
 - [PATCH] Remove unused field TypeVariableImpl.EMPTY_ANNOTATION_ARRAY

Changes: https://git.openjdk.org/jdk/pull/15379/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15379&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314734
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15379.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15379/head:pull/15379

PR: https://git.openjdk.org/jdk/pull/15379