review (S) for 6695288

[John Rose]

6695288: runThese tests expr30303 and drem00301m1 fail when compiled  
code executes without deopt
Summary: rework Value method for ModD and ModF, to DTRT for infinities

http://webrev.invokedynamic.info/jrose/6695288

(This is blocking my push for 6652736, which paradoxically fails to  
integrate because it increases test coverage.)

Thanks,
-- John