Fix verilog-mode vmm statements and AUTOINPUTREG ignores.

Fix verilog-mode vmm statements and AUTOINPUTREG ignores.

* lisp/progmodes/verilog-mode.el (verilog-vmm-statement-re):
Fix vmm statement regexps. Reported by Mattias Engdegard.
(verilog-auto-reg-input)
(verilog-auto-reg-input-assigned-ignore-regexp): For AUTOINPUTREG,
allow ignoring assignments with new
`verilog-auto-reg-input-assigned-ignore-regexp' variable, bug1401.
Reported by David Rogoff.