These are not quite equivalent -- it is possible that we will start waiting before the query begins.

Tests: dEQP-VK.query_pool.occlusion_query.get_results_conservative*
Change-Id: I66fbe389b5329fbf34ff78cf3cea1078339b2b10
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30728Tested-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>