r300/compiler: Fix yet another regression in register allocation

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c

@@ -177,6 +177,7 @@ static void scan_callback(void * data, struct rc_instruction * inst,
 			reg->Live.Start = -1;
 		else
 			reg->Live.Start = inst->IP;
+		reg->Live.End = inst->IP;
 	} else {
 		if (inst->IP > reg->Live.End)
 			reg->Live.End = inst->IP;