RFR (XS) 8038181: Can't build product VM without precompiled header

[Vladimir Kozlov]

Note, by default we use precompiled header. It is not normal case.

Added missing #include.

https://bugs.openjdk.java.net/browse/JDK-8038181
http://cr.openjdk.java.net/~kvn/8038181/webrev/

Thanks,
Vladimir