[Webkit-unassigned] [Bug 242598] New: Refine C++ coroutine use

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242598

            Bug ID: 242598
           Summary: Refine C++ coroutine use
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: achristensen at apple.com

Task::promise_type::final_suspend() needs to return a std::experimental::suspend_always instead of a std::experimental::suspend_never, otherwise it crashes if we ever use co_return.  We don't yet, but we probably will.

ReceiveOperation and SendOperation inherit from std::experimental::suspend_never but override await_ready with an implementation more like std::experimental::suspend_always, and an await_suspend that actually does something interesting.  Instead of inheriting from std::experimental::suspend_never, just write out everything it does, which just requires adding an await_resume that returns void.

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