Due to how this type of threadsafe refcounting is implemented, it needs to be
implemented using a MFBT-style refcounting base class, somewhat similar to
`SupportsWeakPtr`.
This patch makes NS_IMPL_{ADDREF,RELEASE}_INHERITED intelligently not add
refcount logging for types inheriting from SupportsThreadSafeWeakPtr, as the
default behaviour would break due to weak pointer upgrades not calling through
`AddRef` or `Release`.
In MFBT, the return value of `AddRef` and `Release` on
SupportsThreadSafeWeakPtr is changed to be compatible with nsISupports, so that
this type can be used to implement nsISupports refcounting.
Differential Revision: https://phabricator.services.mozilla.com/D142603
18f7866fc2