Test: dEQP-VK.subgroups.builtin_var.compute.*

Bug: b/126871859
Change-Id: If1585778ca5a85e2b8a66f4ddf6a58050620a112
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27089Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>