Enable weak embedded maps in optimized code.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 5459679982d152f63ffad01e0d27d32b40122a38..49fbdd815ad4353a4c868f7b1bfd6e7b783d8f42 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10384,6 +10384,19 @@ void Code::PrintDeoptLocation(int bailout_id) {
 }
 
 
+bool Code::CanDeoptAt(Address pc) {
+  DeoptimizationInputData* deopt_data =
+      DeoptimizationInputData::cast(deoptimization_data());
+  Address code_start_address = instruction_start();
+  for (int i = 0; i < deopt_data->DeoptCount(); i++) {
+    if (deopt_data->Pc(i)->value() == -1) continue;
+    Address address = code_start_address + deopt_data->Pc(i)->value();
+    if (address == pc) return true;
+  }
+  return false;
+}
+
+
 // Identify kind of code.
 const char* Code::Kind2String(Kind kind) {
   switch (kind) {