wuffs 0.4 significantly slower than 0.3 decoding PNGs
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Description
On Windows, Visual studio 2022, no AVX, AMD Ryzen 9 5950x.
```
wuffs 0.3, decoding to WUFFS_BASE__PIXEL_FORMAT__RGB
-----------------------------------------------------
doDecodeFromBufferWithWuffs took 8.4251 ms
doDecodeFromBufferWithWuffs took 8.3683 ms
doDecodeFromBufferWithWuffs took 8.4120 ms
wuffs 0.4, decoding to WUFFS_BASE__PIXEL_FORMAT__RGB
-----------------------------------------------------
doDecodeFromBufferWithWuffs took 12.893 ms
doDecodeFromBufferWithWuffs took 12.906 ms
doDecodeFromBufferWithWuffs took 12.829 ms
```
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