Revised fix for bug 931.
Revised fix for bug 931.

We can't directly determine that a %fork operation is a task or function
call, so need to infer this by comparing the parent and child scopes.

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