Where we can prove that the virtual method is never overriden.
In the case of pure-virtual methods, we remove the method entirely.
Sometimes this leads to entire methods and fields being
eliminated.
Change-Id: I138ef81c95f115dbd8c023a83cfc7e9d5d6d14ae
...mostly done with a rewriting Clang plugin, with just some manual tweaking
necessary to fix poor macro usage.
Change-Id: I71fa20213e86be10de332ece0aa273239df7b61a
...which it did unlike all the other implbaseN.hxx. Required lots of downstream clean-up,
of course.
Change-Id: Ib720e7a0a43410dcd7e6338b84a3973dfbb20866
see https://gerrit.libreoffice.org/#/c/3367/
and Change-Id: I00c96fa77d04b33a6f8c8cd3490dfcd9bdc9e84a for details
Change-Id: I199a75bc4042af20817265d5ef85b1134a96ff5a