Dynamic shadows artifacts

[Deathrey (DeathreyCG)]

@Kalle_H

Doubled performance of PCF soft shadows by simply adding UNROLL attribute for loops. Reordered inner loop math. -7ALU per sample. Default use 32 sample so 224ALU total. https://github.com/EpicGames/UnrealEngine/pull/4508/files

That is a surprise. What hardware did you test on ?