0.9.18.53:

0.9.18.53:
	Optimize MAP and MAP-INTO with vector arguments.

	* Introduce new optimization quality, INSERT-ARRAY-BOUNDS-CHECKS;
	* Use it in the %MAP and MAP-INTO transforms.  (We needed something
	  more fine-grained than (SAFETY 0), because we still want
	  any necessary type-checking to take place.  But we know that
	  eliminating the bounds checks are safe.)