Remove some use of UB #465
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Ensures that SIMD overspill is ZI for decompression, in order to keep UBSAN happy. In reality the UB SIMD lanes are never actually written back to memory, but this keeps UBSAN useful as a tool.
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Parts of the code use undefined behaviour that is benign in practice on the architectures we care about, but trips UB warnings in other tools (Emscripten, UBSAN, etc). This PR cleans this up so that these other tools run cleanly.