Try to optimize inline matrix loads.

Improves performance by a few percent in Gods Eater Burst.
Avoid flushing if the bone matrix is the same.
Optimize loading of texgen matrices.

Pretty small impact, may help games that use them a lot.
Try to load view and model matrices a bit faster.
Merge pull request #5603 from unknownbrackets/gpu-minor

Try to load inline matrices a bit faster