Make call to pow() unambiguous
Make call to pow() unambiguous

pow(int, int) is ambiguous since it could use the double version from
the math library or the verinum version. This patch makes it obvious that
we want to use the double version.

CastMi/iverilog,themperek/iverilog,themperek/iverilog,themperek/iverilog,CastMi/iverilog,CastMi/iverilog