Remove fast_add_function() function

Author: Girgias

UPGRADING.INTERNALS

@@ -30,6 +30,8 @@ PHP 8.3 INTERNALS UPGRADE NOTES
   for C99 features have been removed and therefore macro definitions
   from php_config.h have disappeared.  Do not use those feature
   macros.
+* The fast_add_function() has been removed, use add_function() that will
+  call the static inline add_function_fast() instead.
 
 ========================
 2. Build system changes

Zend/zend_operators.h

@@ -704,28 +704,6 @@ overflow: ZEND_ATTRIBUTE_COLD_LABEL
 #endif
 }
 
-static zend_always_inline zend_result fast_add_function(zval *result, zval *op1, zval *op2)
-{
-	if (EXPECTED(Z_TYPE_P(op1) == IS_LONG)) {
-		if (EXPECTED(Z_TYPE_P(op2) == IS_LONG)) {
-			fast_long_add_function(result, op1, op2);
-			return SUCCESS;
-		} else if (EXPECTED(Z_TYPE_P(op2) == IS_DOUBLE)) {
-			ZVAL_DOUBLE(result, ((double)Z_LVAL_P(op1)) + Z_DVAL_P(op2));
-			return SUCCESS;
-		}
-	} else if (EXPECTED(Z_TYPE_P(op1) == IS_DOUBLE)) {
-		if (EXPECTED(Z_TYPE_P(op2) == IS_DOUBLE)) {
-			ZVAL_DOUBLE(result, Z_DVAL_P(op1) + Z_DVAL_P(op2));
-			return SUCCESS;
-		} else if (EXPECTED(Z_TYPE_P(op2) == IS_LONG)) {
-			ZVAL_DOUBLE(result, Z_DVAL_P(op1) + ((double)Z_LVAL_P(op2)));
-			return SUCCESS;
-		}
-	}
-	return add_function(result, op1, op2);
-}
-
 static zend_always_inline void fast_long_sub_function(zval *result, zval *op1, zval *op2)
 {
 #if ZEND_USE_ASM_ARITHMETIC && defined(__i386__) && !(4 == __GNUC__ && 8 == __GNUC_MINOR__)