bug#51094: Check if run-with{-idle, }-timer needs to create a timer

[Lars Ingebrigtsen]

"Basil L. Contovounesios" via "Bug reports for GNU Emacs, the Swiss army
knife of text editors" <bug-gnu-emacs@gnu.org> writes:

> IIUC, the semantics of SECS=0 (alias nil) is not the same as eager
> funcall, because timer functions are intended to be run asynchronously
> in a separate command loop.  So often what is meant by "now" is e.g. "as
> soon as I quit the current active minibuffer".

Yes, the semantics of running things from a timer are different from
running them in the normal flow, so we can't transform 0-delay timers
into funcalls.

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