Drop IS_CALLABLE_CHECK_SILENT flag

This flag was suppressing *some* but not all errors in
zend_is_callable(), and is no longer used. You can avoid errors
by omitting the error argument.

Author: nikic

Zend/zend_API.c

@@ -3492,7 +3492,7 @@ static zend_always_inline bool zend_is_callable_check_func(int check_flags, zval
 		fcc->calling_scope = ce_org;
 	} else {
 		/* We already checked for plain function before. */
-		if (error && !(check_flags & IS_CALLABLE_CHECK_SILENT)) {
+		if (error) {
 			zend_spprintf(error, 0, "function \"%s\" not found or invalid function name", Z_STRVAL_P(callable));
 		}
 		return 0;
@@ -3610,7 +3610,7 @@ static zend_always_inline bool zend_is_callable_check_func(int check_flags, zval
 				}
 			}
 		}
-	} else if (error && !(check_flags & IS_CALLABLE_CHECK_SILENT)) {
+	} else if (error) {
 		if (fcc->calling_scope) {
 			if (error) zend_spprintf(error, 0, "class %s does not have a method \"%s\"", ZSTR_VAL(fcc->calling_scope->name), ZSTR_VAL(mname));
 		} else {

Zend/zend_API.h

@@ -378,7 +378,6 @@ ZEND_API zend_result zend_disable_class(const char *class_name, size_t class_nam
 ZEND_API ZEND_COLD void zend_wrong_param_count(void);
 
 #define IS_CALLABLE_CHECK_SYNTAX_ONLY (1<<0)
-#define IS_CALLABLE_CHECK_SILENT      (1<<3)
 
 ZEND_API void zend_release_fcall_info_cache(zend_fcall_info_cache *fcc);
 ZEND_API zend_string *zend_get_callable_name_ex(zval *callable, zend_object *object);