Temporarily disables the feature that translate uniform block to
StructuredBuffer on D3D backend for a bug.

Adapted from a patch by xinghua.cao@intel.com

Bug: chromium:1112112
Change-Id: I3419a0eb8ae619e1fa532ffb29f56a9099f04618
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2357752
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
(cherry picked from commit 9ae6d7f2)
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2360409