[RFC] Use wide chars to represent Fortran source internally

[FX]

> Actually, when are they released? I think after some early processing of the
> middle end (e.g. unused variables) the whole source could be thrown away,
> which would reduce the totally needed amount of memory.

We currently release source information at the very end of
compilation, when the finish lang hook is called. I'm not sure we can
reliably do it much earlier.

FX

-- 
FX Coudert
http://www.homepages.ucl.ac.uk/~uccafco/