0.8.15.13:

0.8.15.13:
	Port over / reconstruct ancient CMUCL loop analysis code.
	Improve register allocation:
	... Pack TNs that are used in deep loops first, giving them a
	    higher chance of getting allocated in a register.
	... Inside loops, pack the most used TNs first.
	... When (> SPEED COMPILE-SPEED) attempt to pack the TNs into
	    the most used locations in the SB instead of the earlier
	    behaviour of scattering them into as many locations as
	    possible. This results in tighter allocation / fewer spills.