Removed EG(active_symbol_table) and use corresponding value from EG(current_execute_data)

Removed EG(called_scope) and use corresponding value from EG(current_execute_data)

Removed EG(opline_ptr) and use corresponding value from EG(current_execute_data)

Removed EG(active_op_array) and use corresponding value from EG(current_execute_data)

Uinified call frame handling for user and internal functions.
Now EG(current_execute_data) always point to the call frame of the currently executed function.

Fix bug #67497: eval with parse error causes segfault in generator

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode th

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode that pushes "call frame" on top of VM stack.
"Call frame" is actually the same zend_execute_data structure.
All the following ZEND_SEND instructions push arguments on top of the stack in a way that they directly comes into corresponding CV variables of the called frame. Extra arguments are copied at the end of stack frame (after all CV and TMP variables) on function enterance.

There are two minor incompatibilities:
1) It's not allowed to decalre functions redefining arguments e.g. "function foo($a,$a) {}".
2) func_get_arg() and func_get args() return the current value of argument and not the original value that was sent.

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Use reference counting instead of zval duplication

Fixed apply_func_args_t

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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Optimized zend_leave_helper()

Fixed generator destruction

Fixed destruction of objects and iterators on unclean request shutdown and GC (few cases are still unfixed).
Now we destroy objects it two steps. At first - object properties of all objects and o

Fixed destruction of objects and iterators on unclean request shutdown and GC (few cases are still unfixed).
Now we destroy objects it two steps. At first - object properties of all objects and only then the objects their selves.

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

Iterator has to be properly closed

Refactored GC (incomplete)

Refactored EG(active_symbol_table) to be zend_array* instead of HashTable*

Fixed Generator::throw()

Revert "Move zend_objects_store_put out of zend_object_std_init"

This reverts commit 8ced4f0ac906fd9a28b968801487630326c45bc8.

Move zend_objects_store_put out of zend_object_std_init

Various fixes related to read_property(), read_dimension() and iterators refactoring

Refactoring zend_iterator (incompleted)

Fixed iterators API. zend_iterator_init() has to be used in each get_iterator() callback.

Generator related fixes

Use better data structures (incomplete)