[Mesa-dev] [MR] nir: move pixel_center_integer/origin_upper_left to shader_info.fs

[apinheiro]

https://gitlab.freedesktop.org/mesa/mesa/merge_requests/237

New version of the thread that I sent recently, showing two initial 
versions to solve the regression I found on MR #144:

https://lists.freedesktop.org/archives/mesa-dev/2019-February/214808.html

This MR includes a v2 of the second option. It includes Jason's feedback 
plus some extra cleaning-ups that I found while re-checking the GLSL 
linker (like removing PixelCenterInteger/OriginUpperLeft from 
gl_program, as that info is tracked at gl_program.info.fs.xxx). Due 
that, it touches a lot of places on Mesa.

This MR also includes a second patch, that removes 
pixel_center_integer/origin_upper_left from the ir variable. Basically 
because that is already tracked in a lot of places, so it is not really 
needed. It is on a different patch because I initially though of it as 
something optional, as it is not really required to fix the regression. 
But after finishing it, the only reason to keep it as a different patch 
is to make easier the review. I think that it would be better to squash 
both patches, although I don't have a strong opinion, I would let the 
reviewer give his opinion.


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