Added a file for testing regression of bug #2955 (anomaly in simpl in
the presence of aliased modules). Bug was actually fixed in trunk
(thanks to PMP's monomorphization (and change of semantics) of
equality over evaluable references.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16180 85f007b7-540e-0410-9357-904b9bb8a0f7