Request for reviews (S): 7192965: assert(is_aligned_sets(size)) failed: mask is not aligned, adjacent sets

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7192965/webrev

7192965: assert(is_aligned_sets(size)) failed: mask is not aligned, adjacent sets

Bias coloring in RA does not work for vectors with size > 64 bits, it only works 
for pairs (64 bits).
Change pair check to vector check. I did small refactoring and added comment.

Tested with failing test.

Thanks,
Vladimir