More ZEND_HASH_FOREACH_* related changes

ZEND_HASH_FOREACH_* usage

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

Fixed zend_string/char mess

Cleanup (1-st round)

Fixed passing arguments by reference into array_walk() callbacks.

Reverted to 5a0da281e5a9fa02db18b4822d8b103c65849fa9
Discussion: http://news.php.net/php.cvs/76836

Fix bug #67064 in a BC safe way
You can use an optional parameter now when implementing the Countable interface
to get the $mode passed to count().

Add only_integer_keys option to zend_hash_reindex

This allows to either do a full reindex, or only reindex the integer
keys.

Don't always separate splice replacement array

Only perform separation when a typecast is done. Avoids doing a
full hash copy in many cases.

Add zend_hash_splice

This implements the original functionality of php_splice, but
as an in-place operation, thus avoiding copying the HT.

This is much faster (~10x) if the spli

Add zend_hash_splice

This implements the original functionality of php_splice, but
as an in-place operation, thus avoiding copying the HT.

This is much faster (~10x) if the splice removes a small portion
of the array and doesn't insert many elements.

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Add zend_hash_reindex

The implementation differs from the original in array.c in that it
rehashes the hashtable in the same loop. This is approximately two
times faster (not counting

Add zend_hash_reindex

The implementation differs from the original in array.c in that it
rehashes the hashtable in the same loop. This is approximately two
times faster (not counting the rare case of a purely associative
array).

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Refactored zend_hash_* iteration API zend_hash_fove_forward_ex(ht, pos) and family require second argument to be real pointer.
&(ht)->nInternalPointer should be passed instead of NULL.
zend_h

Refactored zend_hash_* iteration API zend_hash_fove_forward_ex(ht, pos) and family require second argument to be real pointer.
&(ht)->nInternalPointer should be passed instead of NULL.
zend_hash_update_current_key() may work only with internal pointer.

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Various VM optimizations

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

Avoid unnecessry reallocations

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

Use ZVAL_DEREF() macro

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

Fixed extract() support IS_INDIRECT

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

Fixed memory leak

Refactored GC (incomplete)

Fixed support for references