[committed] coroutines: Update func-params-08.C test to suspend three times.

[Iain Sandoe]

Hi,

The awaitable initially committed for this test 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.

tested on x86_64-darwin16,
applied to master,
thanks
Iain
    
gcc/testsuite/ChangeLog:
    
2020-02-28  Iain Sandoe  <i...@sandoe.co.uk>
    
        * g++.dg/coroutines/torture/func-params-08.C: Update
        to suspend for each co_await operation.

diff --git a/gcc/testsuite/g++.dg/coroutines/torture/func-params-08.C 
b/gcc/testsuite/g++.dg/coroutines/torture/func-params-08.C
index c34d143fa68..c166745e052 100644
--- a/gcc/testsuite/g++.dg/coroutines/torture/func-params-08.C
+++ b/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;}
        };