D3D11: Futher optimize input layout cache. *re-land with fix for matrix attributes* Using the new vertex format type enum, we can shrink the size of the input layout tables and reduce draw call overhead further. BUG=angleproject:959 Change-Id: I6d8ad78a003c41f40e7e1caa5972838f8ff4fce8 Reviewed-on: https://chromium-review.googlesource.com/284811 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>