Support variable delay of a variable selected assignment.
Support variable delay of a variable selected assignment.

This patch adds support for the following statement:

<vector>[<i>] <= #<delay> <value>.

It is a copy with slight modification of code from the next
else/if clause.

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