Reviewers: ,

Description:
Extend the inf/nan checking to also check (and print specific messages
for) derivatives. Also, fixed a minor buglet that, for arrays, would
only have checked the first element for inf/nan.


Please review this at http://codereview.appspot.com/199063/show

Affected files:
src/liboslexec/exec.cpp
src/liboslexec/oslexec_pvt.h