RFR: 8216385: ZGC: Fix building without C2

[Per Liden]

Thanks Erik!

Will push under the trivial rule once it has passed tier1.

/Per

On 01/08/2019 09:21 PM, Erik Osterlund wrote:
> +1
> 
> /Erik
> 
>> On 8 Jan 2019, at 21:14, Per Liden <per.liden at oracle.com> 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
>>
>> /Per
>