Fixed warnings related to type conversions leading to potential loss of precision. BUG=18368388 Change-Id: I71a7941df4bcf991f04818060780d4d395e335a9 Reviewed-on: https://swiftshader-review.googlesource.com/1393Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>
