[Bug 93860] Fix Orbital Explorer with INTEL_SCALAR_GS=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93860

            Bug ID: 93860
           Summary: Fix Orbital Explorer with INTEL_SCALAR_GS=1
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: kenneth at whitecape.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Orbital Explorer currently hangs the GPU when run with INTEL_SCALAR_GS=1.  This
would need to be fixed before we could consider enabling the scalar backend by
default.

Also, it generates awful code: something on the order of 3x the number of
instructions, along with spilling.  The vec4 code does not spill.

For reference, here's my fork of orbital explorer that uses waffle and builds
on Linux (the original was Mac OS X focused, and now unmaintained):

https://github.com/kaydenl/orbital-explorer

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