RFR(XS): 8027444: mathExact: assert(i < _max) failed: oob: i=1, _max=1

[Rickard Bäckman]

Hi, can I please have this change reviewed?

One of the loop optimizations we are doing doesn't work well with the
MathExact nodes recently added. The short term fix is to disable the
loop optimization if we detect a MathExact node (or rather a FlagsProj
node). I'll file a RFE for fixing this.

Bug: https://bugs.openjdk.java.net/browse/JDK-8027444
Webrev: http://cr.openjdk.java.net/~rbackman/8027444/

/R