Don't allocate zend_stack elements individually

Instead allocate a vector of elements. Size must now be specified
on initialization rather than on push.

Split IS_BOOL into IS_FALSE and IS_TRUE

Optimized constant lookup

Redesigned zend_execute_data layout now EX(object), EX(scope) and EX(called_scope) arr properties of the current function execution co
ntext. They are set during zend_execute_data initialization

Redesigned zend_execute_data layout now EX(object), EX(scope) and EX(called_scope) arr properties of the current function execution co
ntext. They are set during zend_execute_data initialization and never changed.

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Fixed compilation warnings

Avoid string duplication

Use ZEND_FETCH_FOREACH_* macros to iterate over HashTables instead of zend_hash_move_forward() and family.

Moved zend_literal->cache_slot right into zval.
It should be accessed using Z_CACHE_SLOT() macro.
zend_literal structure is removed.
API functions that accepted pointer to zend_literal no

Moved zend_literal->cache_slot right into zval.
It should be accessed using Z_CACHE_SLOT() macro.
zend_literal structure is removed.
API functions that accepted pointer to zend_literal now accept pointer to zval or cache_slot directly.
Calls of such functiond that now accept cache_slot need to be changed to pass -1 instead of NULL.

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op_array->filename and op_array->filename may be kept in opcache SHM

Fixed reference counting

Cleanup

Cleanup (1-st round)

Fixed zend_object_get_t in simpleXML

Fix some ZTS issues and leaks

Fix ZTS build

This only makes it compile, it doesn't actually work, presumably
because interned strings are assumed in some places.

Refactored zend_hash_* iteration API zend_hash_fove_forward_ex(ht, pos) and family require second argument to be real pointer.
&(ht)->nInternalPointer should be passed instead of NULL.
zend_h

Refactored zend_hash_* iteration API zend_hash_fove_forward_ex(ht, pos) and family require second argument to be real pointer.
&(ht)->nInternalPointer should be passed instead of NULL.
zend_hash_update_current_key() may work only with internal pointer.

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Constant duplication optimization
Argument receiving optimization

Refactored ZVAL flags usage to simplify various checks (e.g. Z_REFCOUNTED(), candidate for GC, etc)

Avoid unnecessry reallocations

Avoid unnecessry reallocation

Fixed parameter passing

Refactored data structures to keep zend_object* instead of a whole zval in some places

Use ZVAL_DEREF() macro

Replaced (Z_TYPE(x) == IS_REFERENCE) with (Z_ISREF(x))

Refactored IS_INDIRECT usage for CV and object properties to support HashTable resizing