[Bug fortran/47266] Optimization: Declare PRIVATE module procedures as "TREE_PUBLIC = 0" ("static function")

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47266

--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Assuming that the test gfortran.dg/module_private_2.f90 at
http://gcc.gnu.org/ml/fortran/2011-01/msg00094.html is intended to cover the
issue at hand and considering that adding the test to the gfortran test suite
does not trigger any regression, I plan to close this PR as fixed as soon as
the test posted at https://gcc.gnu.org/ml/fortran/2015-11/msg00045.html has
been accepted and committed.