merge changes of version/4.02 from r15121 to r15155

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15167 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
merge changes of version/4.02 from r15121 to r15155

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15168 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Reflecting commit 15169 on version/4.02:
PR#6529: fix quadratic-time algorithm in Consistbl.extract.


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15170 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
#6529: further optimize consistency check.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15171 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Synchronize with trunk.

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/abstract_intel_emit@15173 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02