Vulkan: SPIR-V Gen: Support barrier* built-ins This change enables the ComputeShaderTest suite and additionally includes the following fixes: - OpArrayLength was given the array type instead of variable. - Struct arrays inside interface blocks were not decorated with ArrayStride. Bug: angleproject:4889 Change-Id: Ibae95371bcea10e58c86b8fe1d1e172a18d56a09 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3001908 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>