[Bug 110404] Iris fails piglit.spec.ext_transform_feedback.immediate-reuse test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110404

            Bug ID: 110404
           Summary: Iris fails
                    piglit.spec.ext_transform_feedback.immediate-reuse
                    test
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/Iris
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: andrey.simiklit at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

I found that the OpenGL saying:
OpenGL spec:
   "5.3.3 Rules
    .......
    Note: “Updates” via rendering or transform feedback
    are treated consistently with updates via GL commands.
    Once EndTransformFeedback has been issued, any subsequent
    command in the same context that uses the results of the
    transform feedback operation will see the results."

i965 makes the several cache invalidations (VF, L3, ...)
in EndTransformFeedback function to make the streamout result visible for
others
but unfortunately Iris doesn't do it.
I will provide a solution for this issue shortly.

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