Cherry-pick change from astcenc 4.1.0 (#623) #3
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Without the fix SSE2 and SSE4.1 builds that use the decompressor APIs can generate faults on masked stores, as _mm_maskmoveu_si128() doesn't suppress faults on any lanes that are disabled. AVX2 builds are not impacted by this - the AVX2 masked store does suppress faults on masked lanes.
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Without the fix SSE2 and SSE4.1 builds that use the decompressor APIs can generate faults on masked stores, as _mm_maskmoveu_si128() doesn't suppress faults on any lanes that are disabled. AVX2 builds are not impacted by this - the AVX2 masked store does suppress faults on masked lanes.