minor: correct error locations in emit.mlp

From: Pierre Chambart <pierre.chambart@ocamlpro.com>

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15496 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Add 0x400 flag to OCAMLRUNPARAM=v.  It displays the total number of words allocated by the program just before it exits.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15499 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Move constructor and label description records to the bottom of Types.  Conceptually those records don't belong to the type language, and could very well be declared e.g. in Datarepr instead.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15500 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Sync with trunk.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/constructors_with_record4@15501 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02