[Patch, fortran, RFC] PR 40958 Reduce size of module files

[Thomas Koenig]

Hi Salvatore,

> Looks like this is something useful, even though it does not solve the
> size issue. Unfortunately the patch "as is" is incompatible with
> Janne's one.

Thanks for the testing!

Currently, module reading really is horribly inefficient.  What I
implemented on the fly last night was just a bit more sane one-byte
buffering.  As a minumum, we should implement a bigger buffer for module
files to reduce the seeking.

Currently we keep track of the position in the files (line/column)
which also introduces inefficiencies.  Is this something we should
disable with release checking?

	Thomas