tree.h (tree_to_shwi): Add attribute nonnull and pure.

tree.h (tree_to_shwi): Add attribute nonnull and pure.

gcc/ChangeLog:

	* tree.h (tree_to_shwi): Add attribute nonnull and pure.
	(tree_to_poly_int64, tree_to_uhwi, tree_to_poly_uint64): Same.
	(int_fits_type_p): Same.

gcc/ada/ChangeLog:

	* gcc-interface/utils.c (make_packable_type): Introduce a temporary
	to avoid -Wnonnull.
	(unchecked_convert): Same.

From-SVN: r264680