Move prototype metadata from internal properties to prototype maps

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 4b30e28a94f2229bdad0c2a06000adc5f80b88e8..725513014da3a0b4a961fbf6657ef1336bce1913 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -880,6 +880,17 @@ void Box::BoxVerify() {
 }
 
 
+void PrototypeInfo::PrototypeInfoVerify() {
+  CHECK(IsPrototypeInfo());
+  if (prototype_users()->IsWeakFixedArray()) {
+    WeakFixedArray::cast(prototype_users())->FixedArrayVerify();
+  } else {
+    CHECK(prototype_users()->IsSmi());
+  }
+  CHECK(validity_cell()->IsCell() || validity_cell()->IsSmi());
+}
+
+
 void AccessorInfo::AccessorInfoVerify() {
   VerifyPointer(name());
   VerifyPointer(flag());