Properly clamp stencil mask query values to max int. We could overflow when casting from max unsigned int to integer, and return a negative mask. See dEQP functional.state_query.stencil_value_mask_getfloat Change-Id: I59189a40b662ad9d8ded79cdfeded923b98f0b85 Reviewed-on: https://chromium-review.googlesource.com/181780 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Nicolas Capens <nicolascapens@chromium.org> Commit-Queue: Nicolas Capens <nicolascapens@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>