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Add small output buffer inflate benchmark #2062

Benchmarks the inflate fast path with constrained output
buffers ranging from 64 to 16384 bytes per call, reproducing
the libpng decompression pattern described in the "running
off a cliff" analysis.

https://nigeltao.github.io/blog/2021/fastest-safest-png-decoder.html#running-off-a-cliff

5065 of 5659 branches covered (89.5%)

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9626 of 11183 relevant lines covered (86.08%)

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