[Bug 39631] add optimisation helpers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39631

--- Comment #8 from Stephan Bergmann <sbergman at redhat.com> ---
(In reply to comment #7)
> I just dug throught he commit log for glib =) I'd be inclined to simply
> re-use G_LIKELY and G_UNLIKELY with a SAL prefix myself.

That _G_BOOLEAN_EXPR trick would work.  An alternative would be to restrict
this to C++ and instead stick an explicit conversion to bool into the
__builtin_expect call.

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