Remove leftover variables not cleaned up in:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/7250

Change-Id: Ia2e66c15e5cadeed32f564c60d5105c17319e9d4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27028
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>