altos/lisp: convert GC to non-recursive
authorKeith Packard <keithp@keithp.com>
Sun, 6 Nov 2016 18:53:46 +0000 (10:53 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 20 Feb 2017 19:16:50 +0000 (11:16 -0800)
Use a boolean array to note cons cells which would otherwise recurse,
then loop until that array is empty.

Signed-off-by: Keith Packard <keithp@keithp.com>

No differences found