fix avx2 shift semantics #1001
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fix avx2 shift semantics #1001
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This is a follow-up of (PR#973), as it removes masking on shift operations, specifically on the AVX(2) variants. In fact, in AVX2, such masking should never occur (c.f., e.g., https://www.felixcloutier.com/x86/psllw:pslld:psllq)).