Refactoring: merge call_frame and end_execute_data into single data structure. Keep only single copy of each argument on VM stack (previously ZE kept two copies of each arguments for user functions)

Refactoring: use call_frames instead of call_slots

Small call/return improvement

Added comment

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

Merge mainstream 'master' branch into refactoring
During merge I had to revert:
Nikita's patch for php_splice() (it probably needs to be applyed again)
Bob Weinand's patch

Merge mainstream 'master' branch into refactoring
During merge I had to revert:
Nikita's patch for php_splice() (it probably needs to be applyed again)
Bob Weinand's patches related to constant expression handling (we need to review them carefully)
I also reverted all our attempts to support sapi/phpdbg (we didn't test it anyway)

Conflicts:
Zend/zend.h
Zend/zend_API.c
Zend/zend_ast.c
Zend/zend_compile.c
Zend/zend_compile.h
Zend/zend_constants.c
Zend/zend_exceptions.c
Zend/zend_execute.c
Zend/zend_execute.h
Zend/zend_execute_API.c
Zend/zend_hash.c
Zend/zend_highlight.c
Zend/zend_language_parser.y
Zend/zend_language_scanner.c
Zend/zend_language_scanner_defs.h
Zend/zend_variables.c
Zend/zend_vm_def.h
Zend/zend_vm_execute.h
ext/date/php_date.c
ext/dom/documenttype.c
ext/hash/hash.c
ext/iconv/iconv.c
ext/mbstring/tests/zend_multibyte-10.phpt
ext/mbstring/tests/zend_multibyte-11.phpt
ext/mbstring/tests/zend_multibyte-12.phpt
ext/mysql/php_mysql.c
ext/mysqli/mysqli.c
ext/mysqlnd/mysqlnd_reverse_api.c
ext/mysqlnd/php_mysqlnd.c
ext/opcache/ZendAccelerator.c
ext/opcache/zend_accelerator_util_funcs.c
ext/opcache/zend_persist.c
ext/opcache/zend_persist_calc.c
ext/pcre/php_pcre.c
ext/pdo/pdo_dbh.c
ext/pdo/pdo_stmt.c
ext/pdo_pgsql/pgsql_driver.c
ext/pgsql/pgsql.c
ext/reflection/php_reflection.c
ext/session/session.c
ext/spl/spl_array.c
ext/spl/spl_observer.c
ext/standard/array.c
ext/standard/basic_functions.c
ext/standard/html.c
ext/standard/mail.c
ext/standard/php_array.h
ext/standard/proc_open.c
ext/standard/streamsfuncs.c
ext/standard/user_filters.c
ext/standard/var_unserializer.c
ext/standard/var_unserializer.re
main/php_variables.c
sapi/phpdbg/phpdbg.c
sapi/phpdbg/phpdbg_bp.c
sapi/phpdbg/phpdbg_frame.c
sapi/phpdbg/phpdbg_help.c
sapi/phpdbg/phpdbg_list.c
sapi/phpdbg/phpdbg_print.c
sapi/phpdbg/phpdbg_prompt.c

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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

Merge branch 'PHP-5.6'

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

Merge branch 'PHP-5.6'

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)

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

Use ZVAL_DEREF() macro

Replaced (Z_TYPE(x) == IS_REFERENCE) with (Z_ISREF(x))

Refactored GC (incomplete)