Add an IC for CompareNil operations

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 0c83c3aeb0d7e7d394ac7f000cdef73c530a3f32..46a3fb95c01c3226ca552980f7dcdf77342cb2d3 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -3850,6 +3850,11 @@ MaybeObject* Heap::CopyCode(Code* code) {
   ASSERT(!isolate_->code_range()->exists() ||
       isolate_->code_range()->contains(code->address()));
   new_code->Relocate(new_addr - old_addr);
+
+  // Make sure new object is handled properly by the GC.
+  incremental_marking()->RecordWrites(new_code);
+  //  RecordWrites(new_code->address(), 0, Code::kHeaderSize);
+
   return new_code;
 }