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Add compile time calculation of constant ?:

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -1065,6 +1065,18 @@

 		expect(':');

 		ifno = promote(ternary());

 		typeconv(&ifyes, &ifno);

+		if (cond->constant) {

+			TINT i = cond->sym->u.i;

+

+			freetree(cond);

+			if (i == 0) {

+				freetree(ifyes);

+				return ifno;

+			} else {

+				freetree(ifno);

+				return ifyes;

+			}

+		}

 		np = node(OCOLON, ifyes->type, ifyes, ifno);

 		cond = node(OASK, np->type, cond, np);

 	}