DMD backend/el.c is missing vector declarations

[Etienne via Digitalmars-d]

The el_match function on lines 2393-2615 of backend/el.c doesn't 
elaborate cases for simd. I'm not going to make a pull request because I 
don't have time to work through the lengthy process of isolating a 
particular bug, so, here they are for anyone that needs to tweak their 
own dmd:

	case TYfloat4:
	case TYdouble2:
	case TYschar16:
	case TYuchar16:
	case TYshort8:
	case TYushort8:
	case TYlong4:
	case TYulong4:
	case TYllong2:
	case TYullong2:
		if(n1->EV.Vcent.msw != n2->EV.Vcent.msw || n1->EV.Vcent.lsw != 
n2->EV.Vcent.lsw)
			goto nomatch;
			break;