[x265] Performance hit with revision 341049cdcc5c

[Nikos Barkas]

I note a small but measurable performance hit with revision 341049cdcc5c on Windows, compared to earlier revisions. This is on a MinGW build.

My standard encode test run normally takes approximately 57 seconds to complete and hits 1.74-1.75 fps. This revision takes approximately 64.4 seconds, with performance at 1.55 fps.

Looking at the commit, it seems like a blockcpy instruction was replaced with a quite a bit more complicated logic. It is probably expected that performance might be affected, especially if the method where this logic is used runs continuously, but I thought I'd bring this up because it seems like we have a bottleneck and it could be a good idea considering options for optimizing this part.

Best regards
Nikos
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