Remove IS_STATIC_VAR_UNINITIALIZED (#15227)

This flag was never necessary. We know a static variable is uninitialized (i.e.
the initializer has never been called) iff the zval in the sta

Remove IS_STATIC_VAR_UNINITIALIZED (#15227)

This flag was never necessary. We know a static variable is uninitialized (i.e.
the initializer has never been called) iff the zval in the static variable array
does not contain a reference.

Prompted by a related issue in ext-uopz reported by Christoph.

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