Try different number of chroma intra modes for different depths.
Try different number of chroma intra modes for different depths.

- And avoid doing extra work if no extra modes are tested for certain depths.

lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar