RFR(XXS) 8187629: NMT: Memory miscounting in compiler (C2)

[Zhengyu Gu]

Compiler (C2) uses ResourceArea instead of Arena in some circumstances, 
so it can take advantage of ResourceMark. However, ResourceArea is 
tagged as mtThread, that results those memory is miscounted by NMT

Bug: https://bugs.openjdk.java.net/browse/JDK-8187629
Webrev: http://cr.openjdk.java.net/~zgu/8187629/webrev.00/


Test:

   hotspot_tier1 (fastdebug and release) on Linux x64


Thanks,

-Zhengyu