Fix use-after-free of constant name

The constant name is usually interend. Without opcache, compilation always
interns strings. Without opcache, compilation does not intern (new) strings

Fix use-after-free of constant name

The constant name is usually interend. Without opcache, compilation always
interns strings. Without opcache, compilation does not intern (new) strings, but
persisting of script does. If a script is not stored in shm the constant name
will not be interned.

The building of enum backing stores was missing a addref for the constant name,
leading to a double-free when releasing constants and backing stores of enums.

Fixes GH-12366
Closes GH-12405

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