[runtime][ic] Constant field tracking support.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 402eb1a7fc72c7303faa79979ece12fe66ccc6df..4f8ab1324cc06b674cf874236130b41cac058aa1 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -4459,6 +4459,7 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
       } else {
         DCHECK_EQ(kDescriptor, details.location());
         if (details.kind() == kData) {
+          DCHECK(!FLAG_track_constant_fields);
           HandleScope inner(isolate());
           Handle<Name> key = Handle<Name>(descs->GetKey(i));
           Handle<Object> value(descs->GetValue(i), isolate());