This change will remove IndexRange parameter in DrawElements functions.
And calculate it until we truly need it. Meanwhile we add direct
drawing path to avoid retrieving index range for DrawElements*
functions in D3D11 backend. This change may not bring much performance
improvement since we still need to retrieve index range in validation
at the beginning of every DrawElements* call entry point.

BUG=angleproject:1393

Change-Id: I86a8739c0893954c94eb398db62820ced7871565
Reviewed-on: https://chromium-review.googlesource.com/544634Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>