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This mechanism was unsafe to use in any multithreaded context, since
the hook function was invoked on a raw pointer *after* decrementing
the local ref count.
Since we don't use it for anything anymore, let's just get rid of it.
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This commit converts naked `new`s to `AK::try_make` and `AK::try_create`
wherever possible. If the called constructor is private, this can not be
done, so we instead now use the standard-defined and compiler-agnostic
`new (nothrow)`.
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We can't unref an object to destruction while there's still a live
RefPtr to the object, otherwise the RefPtr destructor will try to
destroy it again, accessing the refcount of a destroyed object (before
realizing that oops! the object is already dead)
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Unfortunately adopt_ref requires a reference, which obviously does not
work well with when attempting to harden against allocation failure.
The adopt_ref_if_nonnull() variant will allow you to avoid using bare
pointers, while still allowing you to handle allocation failure.
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