Bug 20891368

Change-Id: Ie293159d2092985c496202eb25733e69f9a3ff6f
Reviewed-on: https://swiftshader-review.googlesource.com/3252Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>