[release/7.0] Ensure that the SSE fallback for Vector3.Dot masks off the unused element of op1 and op2#74980

carlossanlop merged 3 commits intorelease/7.0dotnet/runtime:release/7.0from

backport/pr-74932-to-release/7.0dotnet/runtime:backport/pr-74932-to-release/7.0Copy head branch name to clipboard