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Implement brotli's version of lz_extend. #364

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Implement brotli's version of lz_extend. #364

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Commits on Mar 28, 2024

  1. Implement brotli's version of lz_extend. 

    This provides a 2-3% speed up for compression.

Before:

```
Compression             Total  Compressed        | Compression                   |
Method                   Size        Size  Ratio | Iters       Time         Rate |
----------------------------------------------------------------------------------
libdeflate-gzip:1   270062086    85630362  3.154 |    20   26.493 s  194.43 MB/s |
libdeflate-gzip:2   270062086    84037129  3.214 |    20   35.747 s  144.10 MB/s |
libdeflate-gzip:3   270062086    82391861  3.278 |    20   39.707 s  129.73 MB/s |
libdeflate-gzip:4   270062086    81420541  3.317 |    20   43.029 s  119.71 MB/s |
libdeflate-gzip:5   270062086    78832080  3.426 |    20   50.630 s  101.74 MB/s |
libdeflate-gzip:6   270062086    78021372  3.461 |    20   63.719 s   80.84 MB/s |
libdeflate-gzip:7   270062086    77594012  3.480 |    20   87.918 s   58.59 MB/s |
libdeflate-gzip:8   270062086    77190199  3.499 |    20  147.452 s   34.93 MB/s |
libdeflate-gzip:9   270062086    77156775  3.500 |    20  191.025 s   26.97 MB/s |
```

After:

```
Compression             Total  Compressed        | Compression                   |
Method                   Size        Size  Ratio | Iters       Time         Rate |
----------------------------------------------------------------------------------
libdeflate-gzip:1   270062086    85630362  3.154 |    20   26.228 s  196.39 MB/s |
libdeflate-gzip:2   270062086    84037129  3.214 |    20   34.950 s  147.38 MB/s |
libdeflate-gzip:3   270062086    82391861  3.278 |    20   39.140 s  131.61 MB/s |
libdeflate-gzip:4   270062086    81420541  3.317 |    20   41.927 s  122.86 MB/s |
libdeflate-gzip:5   270062086    78832080  3.426 |    20   50.023 s  102.97 MB/s |
libdeflate-gzip:6   270062086    78021372  3.461 |    20   61.799 s   83.35 MB/s |
libdeflate-gzip:7   270062086    77594012  3.480 |    20   85.528 s   60.23 MB/s |
libdeflate-gzip:8   270062086    77190199  3.499 |    20  145.867 s   35.31 MB/s |
libdeflate-gzip:9   270062086    77156775  3.500 |    20  189.208 s   27.22 MB/s |
```
    @LucasSloan
    LucasSloan committed Mar 28, 2024
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