Update V8 to r3431 as required by WebKit r51976.
Change-Id: I567392c3f8c0a0d5201a4249611ac4ccf468cd5b
diff --git a/src/macros.py b/src/macros.py
index ddd2f13..5b06099 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -77,12 +77,12 @@
macro IS_NULL(arg) = (arg === null);
macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
macro IS_UNDEFINED(arg) = (typeof(arg) === 'undefined');
-macro IS_FUNCTION(arg) = (typeof(arg) === 'function');
macro IS_NUMBER(arg) = (typeof(arg) === 'number');
macro IS_STRING(arg) = (typeof(arg) === 'string');
-macro IS_OBJECT(arg) = (typeof(arg) === 'object');
macro IS_BOOLEAN(arg) = (typeof(arg) === 'boolean');
+macro IS_OBJECT(arg) = (%_IsObject(arg));
macro IS_ARRAY(arg) = (%_IsArray(arg));
+macro IS_FUNCTION(arg) = (%_IsFunction(arg));
macro IS_REGEXP(arg) = (%_ClassOf(arg) === 'RegExp');
macro IS_DATE(arg) = (%_ClassOf(arg) === 'Date');
macro IS_NUMBER_WRAPPER(arg) = (%_ClassOf(arg) === 'Number');