⚡ Bolt: Optimize write_match_fast and fix CRC32 benchmark

[404Setup]

💡 What:

1. Optimized write_match_fast in src/compress/mod.rs by combining the bitstream writes for match length and offset when their combined bit count is <= 32. This reduces the number of bitcount checks and buffer stores.
2. Fixed the crc32_slice8 benchmark in benches/bench_main.rs by wrapping the input data in std::hint::black_box.

🎯 Why:

1. Bitstream writing is a hot path for fast compression levels (e.g., Level 1), especially for small files where matches are short. Reducing overhead here improves throughput.
2. The crc32_slice8 benchmark was reporting impossibly high throughput (27 TiB/s) because the compiler was hoisting the pure function call out of the loop (Loop Invariant Code Motion). black_box prevents this.

📊 Impact:

• Improves Level 1 compression throughput for small inputs (e.g., 1KB) by ~2.4% (205 MiB/s -> 210 MiB/s).
• Ensures crc32_slice8 benchmark reports realistic numbers (~1.3 GiB/s) for future optimization work.

🔬 Measurement:

• cargo bench --bench bench_main "Compress/libdeflate-rs XXS Level 1"
• cargo bench --bench bench_main "CRC32 Slice8"

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PR created automatically by Jules for task 17350663453863150625 started by @404Setup

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