RFR(XS): Use lock version memory allocator

[Zhengyu Gu]

That's why ShenandoahHeapRegion has to override it.

-Zhengyu


On 02/27/2017 11:16 AM, Roman Kennke wrote:
> If I remember correctly, this throws asserts in debug mode. It wants an acquired Heap_lock.
>
> RomanAm 27.02.2017 5:12 nachm. schrieb Zhengyu Gu <zgu at redhat.com>:
>> Use lock version of heap region memory allocator.
>>
>> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/memory_allocate/webrev.00/
>>
>> Test:
>>     fastdebug/release jdk: specjvm Derby
>>
>>
>> Thanks,
>>
>> -Zhengyu
>>