[pull] master from fraunhoferhhi:master#166
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Simplify the `foldingRequired` calculation by deriving the four row distances from the first row in each 4 row group. Since `startHeight` and loop row offset are `STEP_Y` aligned, any CTU wrap can only occur after those four rows. This new version improves performance by approximately ~2% when compared to the existing Neon version when benchmarked on a Neoverse V2 with LLVM 22.
Skip clipping for fixed filter sets in Filter7x7Blk_neon. Fixed ALF luma filter sets use the default clip value, so clipping does not affect the filtered differences. Add a `isFixedFilterSet` flag through the ALF filter callbacks, including 5x5, scalar, Neon, and x86 paths. Use `isFixedFilterSet` in the Neon 7x7 path to select a no-clip implementation. The fixed-filter no-clip case shows an approximate 45% reduction when benchmarked on a Neoverse V2 with LLVM 21. Non-fixed filter sets continue to use the clipped path. Extend filterBlk unit test to check both clipped and fixed-filter 7x7 modes.
Arm: Update Neon implementation for Filter7x7Blk
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