Fixed compilation warnings

Convert zval_get_string() into "fast path" macro and "slow path" function

Use zval_get_string in a few more places

Use zval_get_string in print_zval and propagate TSRMLS

Cleanup

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->function_name, op_array->doc_comments and op_array->filename may be kept in opcache SHM

Fixed reference counting

Cleanup (2-nd round)

Cleanup (1-st round)

Fixed interface constants inheritance.
Now we use IS_REFERENCE for inhereted class constants.
I might miss some edje cases.

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

Fix ZTS build

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

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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Constant duplication optimization
Argument receiving optimization

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

Changed data layout to allow more efficient operations

Avoid unnecessry reallocations

Use STR_COPY() instead of STR_DUP() where possible

STR_DUP() doesn't duplicate interned strings anymore. In case new string is required STR_INIT() or STR_ALLOC() should be used.

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

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

Refactored GC (incomplete)

Fixed function name comparation

Fixed add_ref asseration fail