[x265] patch for faster intra

[Steve Borho]

On 08/04, dave wrote:
<snip>
> all-angs uses a lookup table in intrapred.cpp to determine filtering.  If
> the table were more publicly available that would help speed things up.
> Also, the table and Predict::filteringIntraReferenceSamples don't return the
> same results for all possible values.

We could make a similar table in predict.h which uses an int64_t bitmap
per size.  I'm concerned about the mismatch though, we'll want to fix
that first. Did you note the circumstances when it didn't match the
output of filteringIntraReferenceSamples?

-- 
Steve Borho