A step toward being able to run many of dEQP-VK.glsl.*

Bug: b/126870789
Change-Id: Id53d5a511d7f0fa10994c46254529027ad773542
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26569Tested-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>