LWG4349 task is not actually started lazily

Fixes NB US 258-381 (C++26 CD).

Author: eisenwave

source/exec.tex

@@ -7423,7 +7423,7 @@
 
     task get_return_object() noexcept;
 
-    auto initial_suspend() noexcept;
+    static constexpr suspend_always @\libmember{initial_suspend}{task::promise_type}@() noexcept { return {}; }
     auto final_suspend() noexcept;
 
     void uncaught_exception();
@@ -7509,22 +7509,6 @@
 \tcode{coroutine_handle<promise_type>::\brk{}from_promise\brk{}(*this)}.
 \end{itemdescr}
 
-\indexlibrarymember{initial_suspend}{task::promise_type}%
-\begin{itemdecl}
-auto initial_suspend() noexcept;
-\end{itemdecl}
-\begin{itemdescr}
-\pnum
-\returns
-An awaitable object of unspecified type\iref{expr.await} whose
-member functions arrange for
-\begin{itemize}
-\item the calling coroutine to be suspended,
-\item the coroutine to be resumed on an execution agent of the
-execution resource associated with \tcode{\exposid{SCHED}(*this)}.
-\end{itemize}
-\end{itemdescr}
-
 \indexlibrarymember{final_suspend}{task::promise_type}%
 \begin{itemdecl}
 auto final_suspend() noexcept;