coroutines: Update func-params-08.C to suspend three times.

The awaitable initially committed was returning "always ready"
which meant that the suspension code was not used.  Update
the test to suspend at each co_await, since this exercises more
of the infrastructure.

gcc/testsuite/ChangeLog:

2020-02-28  Iain Sandoe  <iain@sandoe.co.uk>

	* g++.dg/coroutines/torture/func-params-08.C: Update
	to suspend for each co_await operation.

gcc/testsuite/ChangeLog

+2020-02-28  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* g++.dg/coroutines/torture/func-params-08.C: Update
+	to suspend for each co_await operation.
+
 2020-02-28  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/92785

gcc/testsuite/g++.dg/coroutines/torture/func-params-08.C

@@ -46,7 +46,7 @@ struct Foo {
 	{
 	  int v;
 	  awaitable (int _v) : v(_v) {}
-	  bool await_ready() { return true; }
+	  bool await_ready() { return false; }
 	  void await_suspend(coro::coroutine_handle<>) {}
 	  int await_resume() { return v;}
 	};