Start up GUILE type system before anything else

Start up GUILE type system before anything else

This permits using our datatypes in the general Scheme initialization
phase without crashing or order dependencies.

This should be a more reliable and less invasive implementation of the
task attempted with issue 4360.

[lemzwerg, 2015-05-06 13:56:48]

LGTM.

[Carl, 2015-05-06 14:39:02]

LGTM.  I'm glad you have enough knowledge of how the compiler works to make this
patch!

[dak, 2015-05-06 18:52:14]

On 2015/05/06 14:39:02, Carl wrote:
> LGTM.  I'm glad you have enough knowledge of how the compiler works to make
this
> patch!

Actually, the new code stays away as far as possible from the stuff requiring
intimate knowledge of the compiler.

I put in a comment for the _old_ startup code documenting the language quirks it
accommodates, and it took me several days of debugging and standard reading to
understand why the code is written in the manner it is.

So the part requiring knowledge of how the compiler works is the comment on the
old code.  And the new code stays the heck away from that area.  Maybe it would
be worthwhile to move the old code to the kind of scheme the new one uses.  But
at least with the comment in it it's educational.

[Dan Eble, 2015-05-07 03:03:12]

LGTM