bug#41242: Port feature/native-comp to Windows - Reduce the number of files probed when finding a lisp file.

[Nicolas Bértolo]

> Perhaps if you are chasing the hash bug I guess is more important now.

I agree, but that bug keeps eluding me. I thought of not using a Lisp hashtable
and moving to an adhoc C list may be better.

> there is also the possibility that we are going to change radically all
> the eln load mechanism.

No I hadn't. That sounds good. But there are a few issues that I'm not sure
about. How would you build the hash? Only the filename? The full path? Both of
these options have problems. The current approach makes it easy to avoid
filename collisions and to associate .eln files with their source code.

Right now I'm trying to fix a bug that prevents the Windows build from dumping.
It only happens in 64 bits and nativecomp does not make a difference, but I
haven't been able to reproduce it in master. It occurs during the marking stage
of the GC.

I'll have to bisect the newest changes from master, as I see there has been work
on the GC fixing bugs.

Nico.