Cherry pick commit 14857 from 4.02.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15065 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Cherry pick commit 14989 from 4.02 (#6463: properly propagate errors raised when creating the mapper (typically, invalid arguments) to the compiler.).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15066 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Cherry pick commit 14900 from 4.02 (fix some whitespace and add a few copyright headers), only the in parsing/ subdirectory (it creates conflicts elsewhere).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15067 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Cherry-pick 15062,15063,15064 from 4.02 (#6497).

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15068 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02