[Chicken-hackers] [PATCH] Track all potential values for use when generating assigned global lambda infos

[Evan Hanson]

>From the commit message:

This changes the "potential-value" item in the analysis database from a
single value to a list of values, so that all assignments to a global
can be tracked and used when generating lambda info. Previously, only
the last assignment would be remembered, with any previously-encountered
potential value being clobbered.

Fixes #1363.

Sincerely,

Evan