Print a better error message for a '~' token in front of ('&' | '|' | '^')
Print a better error message for a '~' token in front of ('&' | '|' | '^')

Some users may expect this to work so this patch catches these
specific cases and tells the user to use the singe unary operators
'~&', etc. instead.

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