RFR: 8287980: Build is broken due to SuperWordMaxVectorSize when C2 is disabled after JDK-8287697

[Jie Fu]

Hi all,

Please review this trivial patch which fixes the build broken when C2 is disabled due to `SuperWordMaxVectorSize`.

Thanks.
Best regards,
Jie

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Commit messages:
 - 8287980: Build is broken due to SuperWordMaxVectorSize when C2 is disabled after JDK-8287697

Changes: https://git.openjdk.java.net/jdk/pull/9078/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9078&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287980
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9078.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9078/head:pull/9078

PR: https://git.openjdk.java.net/jdk/pull/9078