gcc/:
	* opts.c (finish_options): If -fsplit-stack, disable implicit
	-forder-blocks-and-partition.
	* doc/invoke.texi (Optimize Options): Document that when using
	-fsplit-stack -forder-blocks-and-partition is not implicitly
	enabled.
gcc/go/:
	* go-lang.c (go_langhook_post_options): If -fsplit-stack is turned
	on, disable implicit -forder-blocks-and-partition.
gcc/testsuite/:
	* gcc.dg/tree-prof/split-1.c: New test.

From-SVN: r249071