D3D: Generate more shader debug info by default. The debug info can be very useful to WebGL developers. Instead of hiding the feature behind an unsupported and broken flag, always enable it so that WebGL devs can access the useful translated info. Change the debug info policy to build the full info (including generated assembly) in Debug, and all info excepth the assembly in Release. BUG=angleproject:1179 Change-Id: I25656b76b8437cb2edc9d88cd33f2c4d19b6a3f0 Reviewed-on: https://chromium-review.googlesource.com/313160 Tryjob-Request: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>