Cleanup unary float operators.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15214 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Cleanup.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15215 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Get rid of instruction name for error message (can be retrieved from stacktrace if needed).

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15216 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Simplify.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15217 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02