This patch is the first one of using ShaderMap in both DynamicHLSL and
StateManager11 to make the code cleaner and more straightforward.

BUG=angleproject:2169

Change-Id: I2b206d0250f5ced071cc1c3632367b16e5e02dfb
Reviewed-on: https://chromium-review.googlesource.com/1089473Reviewed-by: Jiajia Qin <jiajia.qin@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>