zstd: Improve match speed of fastest level.#241
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Inline matchlen code and slightly simplify it. This loses a small amount of compression but gives a big speedup. Before/after, best of 3 runs each: ``` file out level insize outsize millis mb/s enwik9 zskp 1 1000000000 343831004 4202 226.91 enwik9 zskp 1 1000000000 343848582 3682 258.97 github-june-2days-2019.json zskp 1 6273951764 698824137 10787 554.67 github-june-2days-2019.json zskp 1 6273951764 699045015 10474 571.23 github-ranks-backup.bin zskp 1 1862623243 454018274 4833 367.54 github-ranks-backup.bin zskp 1 1862623243 454072815 4568 388.82 rawstudio-mint14.tar zskp 1 8558382592 3667295557 21060 387.55 rawstudio-mint14.tar zskp 1 8558382592 3667489370 20207 403.90 nyc-taxi-data-10M.csv zskp 1 3325605752 641244049 10954 289.53 nyc-taxi-data-10M.csv zskp 1 3325605752 641339945 9668 328.01 gob-stream zskp 1 1911399616 234947276 3514 518.62 gob-stream zskp 1 1911399616 235022249 3354 543.36 ```
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Inline matchlen code and slightly simplify it. This loses a small amount of compression but gives a big speedup. This seems reasonable at the fastest level.
Before/after, best of 3 runs each: