RFR: 8307945: Build of Client VM is broken after JDK-8307058

[Jie Fu]

Please review this small fix which fix the build failure of client VM.
Thanks.

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Commit messages:
 - 8307945: Build of Client VM is broken after JDK-8307058

Changes: https://git.openjdk.org/jdk/pull/13934/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13934&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307945
  Stats: 7 lines in 1 file changed: 4 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13934.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13934/head:pull/13934

PR: https://git.openjdk.org/jdk/pull/13934