Still not quite right with vaapi or before this, but that's a different hard to
see issue without a res test of the correct height.

This one seems to start with -

commit 16be87c904293c2e53d50cc3519789a604a6a33b
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Tue Sep 13 14:25:44 2016 +0200

    radeonsi: get rid of img/buf/sampler descriptor preloading (v2)

    26011 shaders in 14651 tests
    Totals:
    SGPRS: 1251920 -> 1152636 (-7.93 %)
    VGPRS: 728421 -> 728198 (-0.03 %)
    Spilled SGPRs: 16644 -> 3776 (-77.31 %)
    Spilled VGPRs: 369 -> 369 (0.00 %)
    Scratch VGPRs: 1344 -> 1344 (0.00 %) dwords per thread
    Code Size: 36001064 -> 35835152 (-0.46 %) bytes
    LDS: 767 -> 767 (0.00 %) blocks
    Max Waves: 222221 -> 222372 (0.07 %)
    Wait states: 0 -> 0 (0.00 %)

    v2: merge codepaths where possible