verilog-auto-inst-template-numbers

verilog-auto-inst-template-numbers is a variable defined in `verilog-mode.el'.
Its value is

nil

• This variable is safe as a file local variable if its value
  satisfies the predicate `(lambda (x) (memq x (quote (nil t lhs))))'.

Documentation:
If true, when creating templated ports with AUTOINST, add a comment.

If t, the comment will add the line number of the template that
was used for that port declaration. This setting is suggested
only for debugging use, as regular use may cause a large numbers
of merge conflicts.

If 'lhs', the comment will show the left hand side of the
AUTO_TEMPLATE rule that is matched. This is less precise than
numbering (t) when multiple rules have the same pin name, but
won't merge conflict.

You can customize this variable.