RFR(S): 8233113: ARM32: assert on UnsafeJlong mutex rank check

[Boris Ulasevich]

Hi,

Recent JDK-8184732 change adds the assertion that fires on UnsafeJlong 
mutex rank check, on platforms without 64 bit atomics 
compare-and-exchange support. On preliminary review (thanks to Coleen 
and David!) it is suggested to remove the assertion and corresponding 
test codes.

http://bugs.openjdk.java.net/browse/JDK-8233113
http://cr.openjdk.java.net/~bulasevich/8233113/webrev.01

Thanks,
Boris