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: Ic54328e3d712e28a40efb4e63b8fce0baeb4ef42
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1619785
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>