anv: pipeline statistics changes for shader-db
What does this MR do and why?
This MR improves shader-db run comparison by avoiding to confuse the tool.
We change 2 things :
- always report workgroup memory size (0 if stage doesn't support it)
- only report max simd width on simd8 fragment shaders (otherwise each variant reports a change in the shader-db comparison)
Edited by Lionel Landwerlin