Add read only handles for the following predefined symbols

vm/assembler.cc

Index: vm/assembler.cc
===================================================================
--- vm/assembler.cc	(revision 15918)
+++ vm/assembler.cc	(working copy)
@@ -151,7 +151,7 @@
 void AssemblerBuffer::EmitObject(const Object& object) {
   // Since we are going to store the handle as part of the fixup information
   // the handle needs to be a zone handle.
-  ASSERT(object.IsZoneHandle());
+  ASSERT(object.IsNotTemporaryScopedHandle());
   ASSERT(object.IsOld());
   EmitFixup(new PatchCodeWithHandle(pointer_offsets_, object));
   cursor_ += kWordSize;  // Reserve space for pointer.