Some CPU architectures require all memory accesses to be naturally aligned. We read polygon outline spans in pairs, so we need two underflow spans. b/37478805 Change-Id: If74fd59654fb6fa56cbed93122b496b9e86dda06 Reviewed-on: https://swiftshader-review.googlesource.com/9528Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>
