It's quite common to want the object and the type. Fix up these cases.

Avoids a second Object lookup.

Change-Id: Ied1ae0c8d264cfe6c6ff3603d0d096bf9f657b84
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/28468
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>