tree-flow.h: Remove some prototypes.

tree-flow.h: Remove some prototypes.

	* tree-flow.h: Remove some prototypes.
	* tree.h: Remove some protypes, add a couple.
	* tree.c (using_eh_for_cleanups_flag, using_eh_for_cleanups,
	using_eh_for_cleanups_p): Add interface routines for front ends.
	* tree-eh.h: New file.  Add protoptyes.
	* tree-eh.c (using_eh_for_cleanups_p, using_eh_for_cleanups): Delete.
	(add_stmt_to_eh_lp_fn): Make static.
	(lower_try_finally): Use new using_eh_for_cleanups_p.
	* emit-rtl.c: Include tree-eh.h.
	* gimple.h: Include tree-eh.h.

From-SVN: r203273