Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 2a0eda0a551229eface54be75d02400b6c0be6ff..997103f18f83c40c314f4cc8fc0abdd7873c8662 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -284,9 +284,14 @@ void AddWeakObjectToCodeDependency(Isolate* isolate, Handle<HeapObject> object,
                                    Handle<Code> code) {
   Handle<WeakCell> cell = Code::WeakCellFor(code);
   Heap* heap = isolate->heap();
-  Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
-  dep = DependentCode::InsertWeakCode(dep, DependentCode::kWeakCodeGroup, cell);
-  heap->AddWeakObjectToCodeDependency(object, dep);
+  if (heap->InNewSpace(*object)) {
+    heap->AddWeakNewSpaceObjectToCodeDependency(object, cell);
+  } else {
+    Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
+    dep =
+        DependentCode::InsertWeakCode(dep, DependentCode::kWeakCodeGroup, cell);
+    heap->AddWeakObjectToCodeDependency(object, dep);
+  }
 }
 
 }  // namespace