gcc/

	* coretypes.h (gimple_stmt_iterator_d): Forward declare.
	(gimple_stmt_iterator): New typedef.
	* gimple.h (gimple_stmt_iterator): Rename to...
	(gimple_stmt_iterator_d): ... This.
	* doc/tm.texi.in (TARGET_FOLD_BUILTIN): Detail restriction that
	trees be valid for GIMPLE and GENERIC.
	(TARGET_GIMPLE_FOLD_BUILTIN): New.
	* gimple-fold.c (gimple_fold_call): Call target hook
	gimple_fold_builtin.
	* hooks.c (hook_bool_gsiptr_false): New.
	* hooks.h (hook_bool_gsiptr_false): New.
	* target.def (fold_stmt): New.
	* doc/tm.texi: Regenerate.

From-SVN: r198142