[Bug 93859] Implement SIMD8 instanced geometry shader support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93859

            Bug ID: 93859
           Summary: Implement SIMD8 instanced geometry shader support
           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

The SIMD8 GS backend doesn't implement support for instanced geometry shaders
yet.  This should be relatively simple.

Notably, the thread payload is different when InstanceCount > 1 - the ICP
handles are layed out differently.  There may be a few other differences too.

Unfortunately, it appears that we have no Piglit tests that verify that
instanced GS inputs work properly.  All instanced GS tests pass today with the
assert removed, when there is obvious code missing.

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