zstd_btultra corner case
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- C
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Description
`zstd_btultra` performs nearly 2x worse than `zstd_opt` on a edge case file.
```
> seq 100000 999999 > seqs
> zstd seqs -b16e19i0
16#seqs : 6300000 -> 321618 (19.59), 15.0 MB/s , 817.0 MB/s
17#seqs : 6300000 -> 323943 (19.45), 10.6 MB/s , 831.3 MB/s
18#seqs : 6300000 -> 618382 (10.19), 8.60 MB/s , 778.1 MB/s
19#seqs : 6300000 -> 618096 (10.19), 7.31 MB/s , 779.3 MB/s
```
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