Do not refer explictly to the Mem constructor in amd64/emit.mlp.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15234 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Simplify ConstLabel (remove reloc_table, never used, not supported with MASM), remove ConstFloat (not used).

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15235 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Typo.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15236 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Typo.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15237 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02