RFR: 8265798: Minimal build broken by JDK-8261090

[Calvin Cheung]

Please review this small patch for fixing broken minimal build.

Tests:
- [x] linux-x64 minimal vm build locally
- [x] builds-tier5 (including linux-x64-zero and linux-x64-zero-debug)
- [x] tiers1 and 2 (in progress)

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Commit messages:
 - 8265798: Minimal build broken by JDK-8261090

Changes: https://git.openjdk.java.net/jdk/pull/3646/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3646&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265798
  Stats: 3 lines in 2 files changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3646.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3646/head:pull/3646

PR: https://git.openjdk.java.net/jdk/pull/3646