Assorted depth-stencil and MSAA fixes
This series fixes a number of issues we have with depth-stencil textures and MSAA handling.
- fix resource state for DS direct copy
- fix PSO sample count
- fix picking right plane and swizzle in stencil SRV
- fix DS intermediate resource when blitting to the same resource
The series fixes a bunch of piglits from the
gpu -t depth subset.