RFR(XS): Missing memory tags for marking bitmaps

[Zhengyu Gu]

Missing memory tags for the bitmaps will result NMT to report them as "Unknown" memory.
http://cr.openjdk.java.net/~zgu/nmt_tag/webrev/ 
<http://cr.openjdk.java.net/%7Ezgu/nmt_tag/webrev/>
  

Thanks,

-Zhengyu