See this design doc.

Now that we simply replay clips and no longer ever need to store the multisample depth/stencil attachments, we can safely perform clipping on the depth buffer and free up the stencil buffer for Stencil-then-Cover of concave shapes.

Further, since we have a lot more bits to work with in the depth buffer, we can eliminate the need for clip restores altogether.

All of this can be done in a way that synergizes well with optimizing the draw order to minimize overdraw.