RenderPass2 was used for when a depth/stencil attachment is needed, or
the VK_EXT_multisampled_render_to_single_sampled extension.  The logic
that decided this was "has D/S resolve || has MSRTSS extension", but the
function itself asserted that the render pass is using MSRTSS if not D/S
resolve.

This caused an assertion failure on platforms where MSRTSS is present,
but a non-MSRTSS render pass is used.

Bug: chromium:1201455
Change-Id: Iefd26a071303c703a322d946f82474f85f5bf767
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2849180Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>