Set render targets correctly when drawing

Set render targets correctly when drawing

There are some horrible hacks in here -- the draw command should not be
doing anywhere near this much work -- but this gets us to first
triangle.

Passes: dEQP-VK.api.smoke.triangle

Bug: b/124177079
Change-Id: I4240cb8cdce2f4bbb804e88e66d1695ab0b0e41e
Reviewed-on: https://swiftshader-review.googlesource.com/c/25212
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>