Matrix vertex attributes have their columns padded out to vec4s, which I was failing to account for. Scalar NIR expects them to be packed, however. Fixes 1256 dEQP tests on Broadwell. Cc: mesa-stable@lists.freedesktop.org Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Tested-by: Mark Janes <mark.a.janes@intel.com> Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>