Request for reviews (XS): 7100757: The BitSet.nextSetBit() produces incorrect result in 32bit VM on Sparc

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7100757/webrev

7100757: The BitSet.nextSetBit() produces incorrect result in 32bit VM on Sparc

Instruction countTrailingZerosL() should use iRegIsafe dst register since it is 
used in long arithmetic.

Added regression test.

Thanks,
Vladimir