In future, atomic counter and shader storage block will be added into UniformHLSL since
they all need the UAV register. So this change renames UniformHLSL to ResourcesHLSL.

Bug: angleproject:1951
Change-Id: Ie9eda090763fbb516468c138e65e111eb12fe514
Reviewed-on: https://chromium-review.googlesource.com/1193322
Commit-Queue: Jiajia Qin <jiajia.qin@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>