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

Mark all strings stored in SHM as IS_INTERNED to avoid refcounting

Fix use after free for doc_comment persist

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

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 constant lookup

Allocate zend_strings with correct size

For me (32bit) sizeof(zend_string) is 20, which means that the
char[1] array at the end is padded with three bytes. Thus allocating
based on s

Allocate zend_strings with correct size

For me (32bit) sizeof(zend_string) is 20, which means that the
char[1] array at the end is padded with three bytes. Thus allocating
based on sizeof(zend_string)-1 overallocates by those 3 padding bytes.

This commit fixes the allocation size, by using XtOffsetOf.

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

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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Fixed non-interned strings refcounting

Cleanup (2-nd round)

Fixed memory leak

Fix bug #66015 by reverting "Removed operations on constant arrays."

Fixed store of "shared" zend_strings

Allocate HashTable->arData and HashTable->arHash at once

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

Changed data layout to allow more efficient operations

Keep constnat flags

Fixed support for arg_info and type hinfing (TODO: names should be interned)

fixes

fixed craches at request shutdown and memory leaks

Make opcache work (incomplete - optimizer doesn't work yet; crashes on request shutdown)

ext/opcache refactoring (incomplete)