This is a fix to avoid division by zero in initial_placement. #2227
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Description
We successfully adapted VPR to a different build system and compiler, but the execution failed when the code attempted to do a division by zero. Illegal instruction.
Motivation and Context
The prior code worked, but it relied on a floating point division by zero resulting in an "inf" and then being converted to an int. This was sloppy, and relies on particular treatment of a SIGFPE. I think it is much cleaner, and more portable to avoid division if the divisor is zero.
How Has This Been Tested?
Built in our system and tested.