[Patch, fortran] PR29389 and PR33850 - uses for expression traversal

[Paul Richard Thomas]

Dominique,

> Summary of the changes I have applied to the original patch:

'tis what comes of developing on Cygwin without checking on Linux or
something a bit quicker with scripts.  Without bootstrapping, the
build is seriously lenient.

Many thanks for your help.  I'll check assign_10.f90 with -m32 and
-m64 (the necessary change is s/integer(4)/integer/ of course.

If all is well, I'll commit tonight.

Cheers

Paul