i965: Fix handling of MESA_pack_invert in blit (PBO) readpixels.
Fixes piglit GL_MESA_pack_invert/readpixels and GPU hangs with glamor and cairo-gl. Cc: 10.0 9.2 <mesa-stable@lists.freedesktop.org> Reviewed-by:Kenneth Graunke <kenneth@whitecape.org> Reviewed-by:
Ian Romanick <ian.d.romanick@intel.com> Reviewed-by:
Anuj Phogat <anuj.phogat@gmail.com>
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