Continue.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15207 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Improve load_symbol_addr

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15208 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02