RFR(XS): 8213604: Fix missing includes after JDK-8212673

[Doerr, Martin]

Hi,

can I get a review for the next trivial build fix, please?

Bug:
https://bugs.openjdk.java.net/browse/JDK-8213604

Webrev:
http://cr.openjdk.java.net/~mdoerr/8213604_missing_include/webrev.00/

Best regards,
Martin

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