Revert of [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 997103f18f83c40c314f4cc8fc0abdd7873c8662..2a0eda0a551229eface54be75d02400b6c0be6ff 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -284,14 +284,9 @@
                                    Handle<Code> code) {
   Handle<WeakCell> cell = Code::WeakCellFor(code);
   Heap* heap = isolate->heap();
-  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);
-  }
+  Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(object));
+  dep = DependentCode::InsertWeakCode(dep, DependentCode::kWeakCodeGroup, cell);
+  heap->AddWeakObjectToCodeDependency(object, dep);
 }
 
 }  // namespace