PATCH: Make mudflap run faster

[Frank Ch. Eigler]

Herman ten Brugge <hermantenbrugge@home.nl> writes:

> Some time ago I mentioned a bug in mudflap. The uncache_object
> function did not work for large objects. The code was modified but
> this also had a large runtime effect I did not notice.  I solved the
> runtime problem in the patch below.  [...]

The search iterations are getting too complicated for me to follow.
Would you mind adding some comments sketching out the cache content
scenarios intended to be covered by each of the various conditionals
and loops?

- FChE