[Bug 90158] Make shader precompile guess MSAA layout properly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90158

--- Comment #2 from Kenneth Graunke <kenneth at whitecape.org> ---
Assuming it works, here's a better idea: kill the field altogether.  Just treat
all surfaces like CMS.

According to the docs:
"If ld_mcs is issued on a surface with MCS disabled, this message returns zeros
in all channels."

I'm pretty sure it'll work for UMS and maybe even IMS.  It's a bit of extra
work in the shader for the non-CMS case, but most things are CMS anyway.

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