This cl adds support for the VK_KHR_create_renderpass2. It doesn't
add any new functionality and ignores any new performance hints
that are part of this extension, but it properly supports the new
API entries that are part of this extension.

Bug: b/148884281
Tests: dEQP-VK.*

Change-Id: I15d9d00658e65380f4e93e59299a8c5e5212f95e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40988
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>