Get rid of invalid assertion and cleanup zend_call_method

Closes GH-8672

Verify internal types before abandoning call frame

An internal caller executing a builtin method with
a static return type will lose context if we drop
our frame before performing th

Verify internal types before abandoning call frame

An internal caller executing a builtin method with
a static return type will lose context if we drop
our frame before performing the validation.

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