master renames phase 1

first shot on merging the core fro the int64 branch

Fixed support for references

Fixed reference support (references to references are not allowed)

Fixed incorrect destruction (it might lead to crash)

Specify HashTable size and optimize inserts that may not conflict

Refactored run_time_cache usage in object handlers

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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Optimized for fast path

Use reference counting instead of zval duplication

Avoid copying of immutable arrays

retval's initializing is already taken by zend_call_function

Use specialized functions instead of macros

Fixed wrong condition

hash find returns zval* now

Add STR_ALLOCA_* API, use in get_method and verify_arg

This avoid unnecessary allocations when using dynamic method
dispatch and class typehints.

Probably there are other places

Add STR_ALLOCA_* API, use in get_method and verify_arg

This avoid unnecessary allocations when using dynamic method
dispatch and class typehints.

Probably there are other places where this should be done as well,
those just stood out for my usage.

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Split IS_BOOL into IS_FALSE and IS_TRUE

Cache knowledge about missing property_info

Combine HashTable.flags and HashTable.nApplyCount into single 32-bit word

Cleanup

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

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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