- Specialized IsClassOf for Number, Boolean, Arguments, and Function.

src/runtime.cc

Index: src/runtime.cc
===================================================================
--- src/runtime.cc	(revision 518)
+++ src/runtime.cc	(working copy)
@@ -246,6 +246,26 @@
 }
 
 
+static Object* Runtime_IsFunctionClass(Arguments args) {
+  return IsSpecificClassOf(args, Heap::function_class_symbol());
+}
+
+
+static Object* Runtime_IsNumberClass(Arguments args) {
+  return IsSpecificClassOf(args, Heap::Number_symbol());
+}
+
+
+static Object* Runtime_IsBooleanClass(Arguments args) {
+  return IsSpecificClassOf(args, Heap::Boolean_symbol());
+}
+
+
+static Object* Runtime_IsArgumentsClass(Arguments args) {
+  return IsSpecificClassOf(args, Heap::Arguments_symbol());
+}
+
+
 static Object* Runtime_IsInPrototypeChain(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);