Small performance improvement for avx-512 on Skylake-SP#191

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rdolbeau:avx512skx

Commits on Jul 14, 2024

Replace Scatter/Gather in AVX512 DP by a sequence of instructions to assemble/disassemble the vector in 128 bits chunks.
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In AVX-512 LDu/STu, handle pair of single as a double.
rdolbeau
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new AVX512 code requires AVX512DQ, add the compiler flags in configure.ac
rdolbeau
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