Re-enable hazard warnings for setting render targets that are currently bound as SRVs.

We can manually unset applied textures in SetRenderTargets. This should fix the spurious warnings
while still showing a warning on error cases.

BUG=
R=geofflang@chromium.org, shannonwoods@chromium.org

Review URL: https://codereview.appspot.com/15880044
3 files changed