For us this works identically to OpVectorTimesScalar.

Bug: b/126873455
Test: dEQP-VK.glsl.matrix.mul.*
Change-Id: Ied8df4af108249a2f0d888d238db497209d01049
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28128Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>