* hooks.h (hook_tree_tree_tree_bool_null): Rename to...
	(hook_tree_tree_int_treep_bool_null): ...this.  Update signature.
	* hooks.c: Likewise.
	* target-def.h (TARGET_FOLD_BUILTIN): Define to
	hook_tree_tree_int_treep_bool_null.
	* target.h: (struct gcc_target): Update signature of fold_builtin
	field.
	* doc/tm.texi (TARGET_FOLD_BUILTIN): Update description and signature.
	* builtins.c (fold_call_expr): Pass call_expr_nargs and CALL_EXPR_ARGP
	instead of the call expression.
	(fold_builtin_call_array): Pass n and argarray directly.
	(fold_call_stmt): Pass nargs and gimple_call_arg_ptr instead of
	consing a list.
	* config/alpha/alpha.c (alpha_fold_builtin): Update signature.  Lift
	MAX_ARGS check out of the loop.  Delete declaration of `arity', declare
	`i' and use it in place of `arity'.
	* config/sparc/sparc.c (sparc_fold_builtin): Update signature.
	Dereference `args' directly.
	* config/xtensa/xtensa (xtensa_fold_builtin): Likewise.

From-SVN: r159585