Fix clearing of dead dependent codes and verify weak embedded maps on full GC.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 0825b64c3367e5d2d92bcd5a8374b3ec616eef6e..73d54174faf33c691605b83104d5e4f44ac02d88 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9508,6 +9508,15 @@ Handle<DependentCodes> DependentCodes::Append(Handle<DependentCodes> codes,
 }
 
 
+bool DependentCodes::Contains(Code* code) {
+  int limit = number_of_codes();
+  for (int i = 0; i < limit; i++) {
+    if (code_at(i) == code) return true;
+  }
+  return false;
+}
+
+
 MaybeObject* JSReceiver::SetPrototype(Object* value,
                                       bool skip_hidden_prototypes) {
 #ifdef DEBUG