The new version of D3DCompile_47.dll that gets bundled with the
Chromium depot_tools Windows SDK seems to crash when compiling these
shaders, I think during the optimization step.

BUG=angleproject:1252
BUG=568170

Change-Id: Ic54a6353ffe3520ecc5e5012721c0a09eb370b22
Reviewed-on: https://chromium-review.googlesource.com/317331
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>