Fix destruction order in zend_shutdown (bug #65463, #66036)

If Apache or a similar SAPI receives a signal during PHP processing
it calls zend_shutdown() without calling shutdown_executor

Fix destruction order in zend_shutdown (bug #65463, #66036)

If Apache or a similar SAPI receives a signal during PHP processing
it calls zend_shutdown() without calling shutdown_executor().
#65463: If a module like Gearman or Memcached is loaded,
in the unfixed version it is unloaded by zend_destroy_modules() before the
CG(CLASS_TABLE) is destructed. When CG(CLASS_TABLE) is destructed,
any pointers to methods (specifically around destruction) in the unloaded
module's .so are now dangling and the process segfaults.
#66036: Any subclasses of an internal class like ArrayObject need
to be destructed in order: subclass first and then the internal class. In the
unfixed version zend_shutdown() clears the CG(CLASS_TABLE) from the head
of the list onwards, so internal classes are destructed first and user-defined
classes last. Internal classes are alloc/deallocated with malloc/free while
user-defined classes with emalloc/efree. If there's shared data between them
then efree() could be called instead of free() leading to a seg-fault.

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cleanup

Fixed bug #67725 (now we create immutable arrays only in SHM)

Support doc comments for propreties

Rename _tmp_compile_const_expr

Also remove recursive immutization of arrays there, because this
is already handled when the array is created.

Fixed unbound scoped closure edge cases and added tests for them

Remove old macro/function

Remove some unused compiler globals

More dead code

zend_get_class_fetch_type works on zend_string

Remove duplicate code

Cleanup dead/duplicate code

Add zend_ast_list* variant to parser stack element

Use more specific parser stack nodes

Cleanup member modifier code

Create namespace_name via AST

zend_do_return -> zend_emit_final_return

Remove dead code

Dead code

Handle __halt_compiler()

Add NS error checks

Those can probably be implemented in a better way now...

Discard NS doc comments

Code cleanup

Fix namespace\, maybe

Port top level stmt

Problem: namespace\foo no longer works :/