Handle missing class when evaluating CONST_ENUM_INIT

When resolving constants on a dynamically declared class during
preloading, the enum class may not be available. Fail gracefully

Handle missing class when evaluating CONST_ENUM_INIT

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?

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Increment refcounts in mutable data copies

For mutable_data on preloaded classes, there may be refcounted
values in the constants/properties table.

Allocate map_ptr for mutable_data during preloading

We need to discard objects in the class constants if they happened
to be evaluated during preloading. To allow doing so, we need to

Allocate map_ptr for mutable_data during preloading

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.

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Fix preloading of enums

We should not store constants that resolve to objects.