Introduce get_properties_for() handler

This handler allows getting the object properties for a particular
purpose, such as array casting, serialization, etc.

Use zend_hash_find() instead of zend_hash_exists()

Replace ZEND_ACC_ANON_BOUND, ZEND_ACC_UNRESOLVED_PARENT and ZEND_ACC_UNRESOLVED_INTERFACES with single ZEND_ACC_LINKED.

Simplify __clone() visibility check (magic methods still don't respect ZEND_ACC_CHANGED).

Merge branch 'PHP-7.3'

* PHP-7.3:
Fixed support for commutative "user opcodes"

Fixed support for commutative "user opcodes"

Cleanup class linking

ZEND_DECLARE_CLASS, ZEND_DECLARE_INHERITED_CLASS and ZEND_DECLARE_INHERITED_CLASS_DELAYED don't need return value anymore.

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VER

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VERIFY_ABSTRACT_CLASS opcodes.

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Replace zend_class_entry->traits by persistent zend_class_entry->trait_names.
Move trait binding code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_TRIAIT and ZEND_BIND_TRAITS opcodes.

Change zend_lookup_class_ex() and zend_fetch_class_by_name() prototypes to accept optional lower-case class name as zend_string*, instead of zval*.

Merge branch 'PHP-7.3'

* PHP-7.3:
Stop using zend_function->reserved[] space.

Stop using zend_function->reserved[] space.

Don't use second operand of BIND_STATIC instruction.

Merge branch 'PHP-7.3'

* PHP-7.3:
Removed dead code

Removed dead code

Merge branch 'PHP-7.3'

* PHP-7.3:
Avoid hash lookups in BIND_STATIC and BIND_LEXICAL opcode handlers. Encode static variable offset into opline->extended_value.

Avoid hash lookups in BIND_STATIC and BIND_LEXICAL opcode handlers.
Encode static variable offset into opline->extended_value.

Added a note

Fixed bug #76752 (Crash in ZEND_COALESCE_SPEC_TMP_HANDLER - assertion in _get_zval_ptr_tmp failed).

Removed duplicate code. zend_fetch_dimension_address_LIST_w() was a copy of zend_fetch_dimension_address_W(), ZEND_FETCH_LIST_W_SPEC_CV_... a copy of ZEND_FETCH_DIM_W_SPEC_CV_...

Improved assignment to "next" element of array ($a[] = ...)

Use better check

Pack zend_constant.flags and zend_constant.module_number into reserved space inside zend_constant.value.

Encode parent class name as IS_CONST operand in DECLARE_INHERITED_CLASS and DECLARE_ANON_INHERITED_CLASS opcodes (eliminate FETCH_CLAS
S opcode).