First step to using marl::Event::any()

Bug: b/144388391
Change-Id: I5c6cb24c2d7a1cdb2bc2935d180f5074a8b68ab7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38137
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Ben Clayton <bclayton@google.com>