Removed EG(in_execution). If EG(currentent_execute_data) is not NULL we are executing something.

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.

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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Fixed string deallocation and code cleanup

Use new zend_hash iteration API

Use absolute addresses as branch targets for NEW, FE_RESET and FE_FETCH

Remove unused included file

Remove unused codes

Improved ZTS support

Initialize GC_TYPE_INFO for EG(symbol_table)

Use specialized functions instead of macros

Save some unnecessary zval copying

Improve call_user_function performance

params are all zval * now, and retval will be initialized in
zend_call_function.

maybe we can make call_user_function as a macro proxy to

Improve call_user_function performance

params are all zval * now, and retval will be initialized in
zend_call_function.

maybe we can make call_user_function as a macro proxy to
call_user_function_ex later.

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Fixed apply_func_arg_t, and it's better not using cast (compiler friendly)

typo

fci->retval is always set

Re-applyed Bob's patch with minor fixes

Reverted Bob's patch (it breaks many tests when run with opcache and needs to be fixed first).

Re-added fix for bug #66015 and adapted for phpng branch

Added comment with problem description and two soltions

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 JMPZNZ to avoid multiplication at runtime (may be it makes sense to use relative addresses everywere it'll lead to Position Independent Code)