Display a warning for a part select of an array.
Display a warning for a part select of an array.

It is illegal to perform a part select on an array. This patch
adds an error message instead of failing an assert.

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