Add dg-require-stack-size

Add dg-require-stack-size

2017-10-19  Tom de Vries  <tom@codesourcery.com>

	* lib/target-supports-dg.exp (dg-require-stack-size): New proc.
	* gcc.c-torture/execute/20030209-1.c: Use dg-require-stack-size.
	* gcc.c-torture/execute/20040805-1.c: Same.
	* gcc.c-torture/execute/920410-1.c: Same.
	* gcc.c-torture/execute/921113-1.c: Same.
	* gcc.c-torture/execute/921208-2.c: Same.
	* gcc.c-torture/execute/comp-goto-1.c: Same.
	* gcc.c-torture/execute/pr20621-1.c: Same.
	* gcc.c-torture/execute/pr28982b.c: Same.
	* gcc.dg/tree-prof/comp-goto-1.c: Same.

	* doc/sourcebuild.texi (Test Directives, Variants of
	dg-require-support): Add dg-require-stack-size.

From-SVN: r253882