1D images are currently sampled as if they're 2D images, by setting the
second coordinate to 0.

Bug: b/129523279
Test: dEQP-VK.binding_model.shader_access.primary_cmd_buf.combined_image_sampler_mutable.fragment.single_descriptor.1d
Change-Id: I9aa20cb8b4d43cfdce28c1ec697a72fb6c49c6b5
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29775Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>