RFR: 8216385: ZGC: Fix building without C2

[Aleksey Shipilev]

On 1/8/19 9:14 PM, Per Liden wrote:
> Building without C2 enabled (e.g. a client VM variant) fails after JDK-8215547, which introduced
> unconditional uses of "MaxVectorSize", a symbol only available when C2 is enabled.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8216385
> Webrev: http://cr.openjdk.java.net/~pliden/8216385/webrev.0

Looks fine and trivial.

-Aleksey

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