Request for reviews (S): 6997311: SIGFPE in new long division asm code

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6997311/webrev.00

Fixed 6997311: SIGFPE in new long division asm code

Regression after changes added for 6987135.
IDIV instruction throws SIGFPE if sign of result
does not fit into 32 bit. I have to use unsigned
DIV instruction and convert negative dividend
to positive and result back. So more code.

Added missing cast to long in 6603011/Test.java
which prevented me to catch this situation during
work on 6987135. Added additional verification
output for failure (the same as for int testing).

Tested with failed Nightly tests and fixed 6603011/Test.