RFR(T) 8219244: NMT: Move safepoint related memory allocations from mtInternal to mtSafepoint

[coleen.phillimore at oracle.com]

This is such a small allocation, I think it makes more sense to add it 
to mtThread.
Coleen

On 2/18/19 3:12 PM, zgu at redhat.com wrote:
> There is only one instance I can find.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8219244
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8219244/webrev.00/
>
> Test:
>
>    hotspot_nmt on Linux x64 (fastdebug and release)
>    JDK-submit tests.
>
> Thanks,
>
> -Zhengyu