- Refactor and move some functions used by D3D that are not really
renderer specific to be used by the Vulkan implementation to support
setting matx uniforms.

Bug: angleproject:2581
Change-Id: Ib37ddf4fc62bb8ecb3629893a24969e1f515795b
Reviewed-on: https://chromium-review.googlesource.com/1079845
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>