Fixed uninitialized symbol_table

Refactored run_time_cache usage in object handlers

Simplify call-frame handling

Removed EG(opline_ptr) 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.

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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C++ compiler doesn't allow cast a void * to other pointer type

Small call/return improvement

Added comment

Fix spl_directory cast_object, reenable error

Removed error message that breaks phar

Sync zend_is_true with convert_to_boolean (fixes GMP test)

GC checks during argument release don't make sense

Split IS_BOOL into IS_FALSE and IS_TRUE

Optimized zend_leave_helper()

Cache op_array->run_time_cache in zend_execute_data for faster access

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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Cleanup (1-st round)

Fixed zend_object_get_t in simpleXML

Removed useless void* parameter and replaced with zend_bool on zval_update_constant* functions

Fixed disallowal of array usage in constants at run-time
Added at the same time the possibility of array dereferencing
to complete the set of features (useful application of arrays in constan

Fixed disallowal of array usage in constants at run-time
Added at the same time the possibility of array dereferencing
to complete the set of features (useful application of arrays in constants)

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Optimized ISSET_ISEMPTY_DIM_OBJ

Use macros

Optimized RECV_* opcodes

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