opjitconv fails with "Floating point exception" when it tries to
convert jit dump file, created by oprofile java agent libjvmti_oprofile.so.
A divide by "totaltime" when totaltime was zero caused the problem.
It is normal to have some symbol lifetife to be = 0 for very fast
invocations within one single time tick (life_start == life_end),
so this patch handles that.
Signed-off-by: Maynard Johnson <email@example.com>
Acked-by: Daniel Hansel <firstname.lastname@example.org>