Some NVIDIA D3D11 drivers are buggy and interprets the level passed to
GetDimensions as being relative to 0, rather than the SRV's MostDetailedMip.
This affects all integer format textures, because the dimensions are used for
sample position calculations with integer format textures, which leads to
sampling outside texture when the base level is non-zero.

Bug: angleproject:3441
Change-Id: Ic012cac94ce0a627221087ecb2ee6aa3665900d1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1617780Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kimmo Kinnunen FI <kkinnunen@nvidia.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>