Fixed two bugs in pattern-matching compilation

- first bug was a missing lift when the return predicate was assumed to be
  a simple evar
- second problem was in the inference of a custom inversion predicate in
  case of matching on a term in a constrained type (like "vect (S n)"):
  the rel bound to local definitions in the instance of evars where
  instantiated (by other evars) which is wrong per se but which contradicted
  the assumptions of find_projectable_vars in evarutil.ml which assumed that
  this did not occur; solved the problem by not instantiating references to
  local definition which (probably) will not loose some opportunity of
  unification in presence of non unfolded local definitions, ...
- also cleaned a bit prepare_predicate

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13112 85f007b7-540e-0410-9357-904b9bb8a0f7

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