quantize: test lowbd in highbd builds
quantize: test lowbd in highbd builds

Change-Id: I7af273e979415a8b8cafb7494728d2736862f4a5

webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx