RFA: Consider int and same-size short as equivalent vector components

[Paolo Carlini]

Hi,

On 08/28/2013 12:29 AM, Joern Rennecke wrote:
> 	* c-common.h: (same_scalar_type_ignoring_signedness): Delete prototype.
>          (vector_types_compatible_elements_p): Prototype.
Sorry for nitpicking, but since we are now using C++ I think declaration 
is more correct than prototype.

Paolo.