0.pre7.86.flaky7.16:

0.pre7.86.flaky7.16:
	(still works as well as before, still fails in
		pathnames.impure.lisp the same way as before, since all
		the changes are still only preparation for a real fix)
	making FIND-INITIAL-DFO recognize closure dependencies,
		continued...
	...In order to make the information conveniently available
		for DFO-SCAVENGE-DEPENDENCY-GRAPH, add a new slot
		LAMBDA-REFERS-TO-VARS, analogous to LAMBDA-CALLS.
	...made IR1-CONVERT-VARIABLE and DEF-IR1-TRANSLATOR SETQ
		set LAMBDA-REFERS-TO-VARS as appropriate
	...wrote untidy CONTINUATION-HOME-LAMBDA to support this
	...tweaked CONTINUATION-STARTS-BLOCK and LINK-BLOCKS so that
		when IR1-CONVERT-IF uses them it sets up links early
		enough to let CONTINUATION-HOME-LAMBDA work
	...made merge-LETs logic merge LAMBDA-REFERS-TO-VARS as it
		already merged LAMBDA-CALLS