Optimized access to global constants using values with pre-calculated hash_values from litersls table

- Removed unused variables

ZEND_RETURN is splitted into two new instructions ZEND_RETURN and ZEND_RETURN_BY_REF

Added a number of small performance tweaks and optimizations
. ZEND_RECV now always has IS_CV as its result
. ZEND_CATCH now has to be used only with constant class names
. ZEND_FET

Added a number of small performance tweaks and optimizations
. ZEND_RECV now always has IS_CV as its result
. ZEND_CATCH now has to be used only with constant class names
. ZEND_FETCH_DIM_? may fetch array and dimension operans in a different order

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Added concept of interned strings. All strings constants known at compile time are allocated in a single copy and never changed.

Changed the structure of op_array.opcodes. The constant values are moved from opcode operands into a separate literal table

restore $this support for closures to its former glory

sed -i "s#1998-2009#1998-2010#g" **/*.c **/*.h **/*.php

Fixed bug #49866 (Making reference on string offsets crashes PHP)

Fixed bug #50351 (performance regression handling objects, ten times slower in 5.3 than in 5.2. foreach statement should not initiate GC)

- Fixed bug #50255 (isset() and empty() silently casts array to object)

- Fixed bug #49908 (throwing exception in __autoload crashes when interface is not defined)

Fixed memleak in tests/lang/engine_assignExecutionOrder_001.phpt

Fixed bug #46074 (Bus error during running PHP CLI under IRIX 6.5.30)

fix crash when unexpectedly passed by-ref parameter is modified

Fixed ability to call user functions from user opcodes without recursion

Fixed bug #49269 (Ternary operator fails on Iterator object when used inside foreach declaration). (Etienne, Dmitry)

Fixed bug #48912 (Namespace causes unexpected strict behaviour with extract())

MFH: Changed error messages to use "cannot" instead of "can not" (meaning "also can")

MFH: better fix for #48409 , #48428 , #48228

MFH:
Restored double->long conversion behavior to that of PHP 5.2 (on most platforms) and prior:
* Out-of-range numbers overflow/preserve least significant bits (no LONG_MAX/MIN limit)

MFH:
Restored double->long conversion behavior to that of PHP 5.2 (on most platforms) and prior:
* Out-of-range numbers overflow/preserve least significant bits (no LONG_MAX/MIN limit)
* See bug #42868 (presumably-rare platform with different results in 5.2)
* On 32-bit platforms with 64-bit long type, a zend_long64 cast has been added,
otherwise it's the same as 5.2
* Use this conversion method everywhere instead of some plain (long) casts

Added 'L' parameter parsing specifier to ensure a LONG_MAX/MIN limit:
* Essentially what 5.3's new conversion was doing in most cases
* Functions with "limit" or "length" type params could be updated to use this,
and prevent confusing overflow behavior with huge numbers (*also* in 5.2)
- See bug #47854, for example; or even #42868 again

# Test updates coming

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MFH: better fix for #48409 , #48428 , #48228

MFH: Fix aliasing issue (fixes #48409 , #48428 , #48228)

Improved specialization (IS_CONST can't be IS_OBJECT)

Fixed bug #47771 (Exception during object construction from arg call calls object's destructor)