... so we can use it for the non-indexed case.

Bug: b/118386749
Tests: dEQP-VK.draw.basic_draw.*
Change-Id: I21f1616db0b6613f8db6bff61f6aa1dfcf67c253
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28356
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>