Request for reviews (S): 7054211: No loop unrolling done in jdk7b144 for a test update() while loop

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7054211/webrev

7054211: No loop unrolling done in jdk7b144 for a test update() while loop

It is anti-delta of changes which removed code for CaffeineMark. A perf 
regression of approximately 13.5% was observed in benchmark with a pure java 
crc32 implementation which use XORs after that changes.

Our refworkload benchmarks are not affected by this fix (and that is why did 
original changes).

Thanks,
Vladimir