Translcore.transl_primitive: enable type-directed optimizations

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15583 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
testsuite/makefiles: a more robust -dlambda test

From: Gabriel Scherer <gabriel.scherer@gmail.com>

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15584 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Add translprim testsuite

From: Frederic Bour <frederic.bour@lakaban.net>

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15585 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02