Dynamically declared classes categorically do not get linked during
preloading, even if all their dependencies are known. The warning
is misleading in this case, and there isn't anything the user can
do to address it.
When resolving constants on a dynamically declared class during
preloading, the enum class may not be available. Fail gracefully
in that case.
Possibly we shouldn't be trying to evaluate constants on
non-linked classes at all?
We need to discard objects in the class constants if they happened
to be evaluated during preloading. To allow doing so, we need to
use mutable_data, which will place the evaluated constants into
a separate table.
