Remove ZVAL_NEW_ARR() macro

This macro is a footgun because it creates an uninitialized array
(only an allocation). This macro is no longer used in php-src,
and we have better alternatives like array_init() or
ZVAL_ARR(arr, zend_new_array(size_hint)).

UPGRADING.INTERNALS

@@ -23,6 +23,8 @@ PHP 8.1 INTERNALS UPGRADE NOTES
        spl_ce_Stringable, spl_ce_Traversable alias class entries have been removed in favor of zend_ce_aggregate,
        zend_ce_arrayaccess, zend_ce_countable, zend_ce_iterator, zend_ce_serializable, zend_ce_stringable,
        zend_ce_traversable.
+     - The ZVAL_NEW_ARR() macro has been removed. Use array_init() or ZVAL_ARR
+       with zend_new_array() instead.
   b. Zend Stream API has been changed to use "zend_string*" instead of "char*"
       - zend_file_handle.filename now is zend_string*
       - zend_file_handle.free_filename is removed. Now zend_file_handle.filename is always released.

Zend/zend_types.h

@@ -957,14 +957,6 @@ static zend_always_inline uint32_t zval_gc_info(uint32_t gc_type_info) {
 		Z_TYPE_INFO_P(__z) = IS_ARRAY_EX;		\
 	} while (0)
 
-#define ZVAL_NEW_ARR(z) do {									\
-		zval *__z = (z);										\
-		zend_array *_arr =										\
-		(zend_array *) emalloc(sizeof(zend_array));				\
-		Z_ARR_P(__z) = _arr;									\
-		Z_TYPE_INFO_P(__z) = IS_ARRAY_EX;						\
-	} while (0)
-
 #define ZVAL_NEW_PERSISTENT_ARR(z) do {							\
 		zval *__z = (z);										\
 		zend_array *_arr =										\