[release/9.0] Ensure that Arm64 correctly handles multiplication of simd by a 64-bit scalar#106972

jeffschwMSFT merged 3 commits intorelease/9.0dotnet/runtime:release/9.0from

backport/pr-106839-to-release/9.0dotnet/runtime:backport/pr-106839-to-release/9.0Copy head branch name to clipboard