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When we decompress images for mutation or hints,
we always specially check for empty compressed data
(I assume it can apper after minimization).
Treat it as correct compressed and return empty decompressed data.
This removes the need in special handling in users.
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Benchmark results:
name old time/op new time/op delta
Decompress-8 24.7ms ± 1% 13.4ms ± 4% -45.81% (p=0.000 n=16+19)
name old alloc/op new alloc/op delta
Decompress-8 67.2MB ± 0% 0.0MB ± 1% -99.98% (p=0.000 n=18+20)
name old allocs/op new allocs/op delta
Decompress-8 188 ± 0% 167 ± 0% -11.17% (p=0.000 n=20+20)
Test process memory consumption drops from 220MB to 80MB.
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Change DecompressWriter to DecompressCheck: checking validity
of the image is the only useful use of DecompressWriter.
Change Decompress to MustDecompress which does not return an error.
We check validity during program deserialization, so all other
uses already panic on errors.
Also add dtor return value in preparation for subsequent changes.
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Move image compression-related function to a separate package.
In preperation for subsequent changes that make decompression
more complex. Prog package is already large and complex.
Also makes running compression tests/benchmarks much faster.
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