ReactorType<Reference<T>> will now resolve to T.

This also enables support of ValueOf(ReactorType<Reference<T>>).
Required for Coroutines.

Bug: b/131672705
Change-Id: Icbc95488f5299b8d70e72142e44af9ed1af598d1
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30569Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>