BUG=angleproject:1160

The find of the map table in GetTextureFormatInfo is showing up as a
hotspot in draw call perf benchmark. Switching the map into a static
switch should make it more efficient.

Other tables that only GetTextureFormatInfo uses is also converted into
static switching instead of maps for performance. Other tables include
swizzle_format_table and load_functions_table which are both only used by
GetTextureFormatInfo to generate the TextureFormat for a given
internalFormat and d3d device caps.

The static switches for each table is generated using a python script
named gen_*.py. The data for each table is stored in JSON files. This
makes it more flexible for additions and deletions.

Change-Id: I0f40fcc2a215c85661863ea225891071cb2f2c71
Reviewed-on: https://chromium-review.googlesource.com/301770Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Tryjob-Request: Dian Xiang <dianx@google.com>
Tested-by: Dian Xiang <dianx@google.com>
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>