RFR: 8290269: gc/shenandoah/TestVerifyJCStress.java fails due to invalid tag: required after JDK-8290023

[Jie Fu]

Hi all,

Please review the trivial fix which fixes a typo (`required` --> `requires`).

Thanks.
Best regards,
Jie

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Commit messages:
 - 8290269: gc/shenandoah/TestVerifyJCStress.java fails due to invalid tag: required after JDK-8290023

Changes: https://git.openjdk.org/jdk/pull/9485/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9485&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290269
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9485.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9485/head:pull/9485

PR: https://git.openjdk.org/jdk/pull/9485