D3D11: Micro-optimize StateManager11::updateState. This inlines several accessors. Bug: angleproject:2574 Change-Id: I61d223dd2a8f08e5331ccefde02e6ce55f5a607d Reviewed-on: https://chromium-review.googlesource.com/1067118 Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>