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Force inline compare256 helpers

The compare256_*_static helpers are textually included into match_tpl.h
to specialize each longest_match variant, and compare256_rle_* serve the
RLE path the same way. At -O3 clang declines to inline the larger fully
unrolled bodies (scalar and NEON), emitting an out-of-line call with
register spills around it on the hot path. Mark them Z_FORCEINLINE so
each inlines into its consumer as intended. GCC already inlines them.

Assisted-By: Claude Opus 4.8

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