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Update AVX-VNNI instruction perf characteristics #109038

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Fixes #52121

Confirmed with uops.info that these have same latency/throughput as other integer multiply+add instructions (5/0.5 on Intel P-Cores)

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@dotnet-policy-service dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label Oct 19, 2024
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Add correct instruction execution characteristics for AVX-VNNI instrinsics
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