RFR: 8153658: Redundant memory copy in LogStreamNoResourceMark

[Stefan Karlsson]

Hi all,

Please review this patch to remove a redundant memory copy in the UL log 
stream classes.

http://cr.openjdk.java.net/~stefank/8153658/webrev.01
https://bugs.openjdk.java.net/browse/JDK-8153658

LogStreamNoResourceMark copies the resource allocated string buffer into 
a new resource allocated string buffer before copying the data to UL.

Moreover, this also causes problem when implementing a log stream class 
using CHeap memory instead of Resource memory. Even though the first 
allocation is done from CHeap the second copy comes from Resource memory.

Thanks,
StefanK