This prepares for simplifying assigning the same scalar to all elements. Bug: b/146224130 Change-Id: I8499c671f98090ae38fd12bab59f30ef360eff69 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39508 Presubmit-Ready: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Ben Clayton <bclayton@google.com>
