Add GC handling for new field in DeoptimizedFrameInfo.

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 525ccec5bab91ee5be43811162396fd7c322672c..682eb535cefdf491e896d13020826835a077e655 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -1603,7 +1603,11 @@ DeoptimizedFrameInfo::DeoptimizedFrameInfo(
   SetFunction(output_frame->GetFunction());
   expression_count_ = output_frame->GetExpressionCount();
   expression_stack_ = new Object*[expression_count_];
-  pc_ = output_frame->GetPc();
+  // Get the source position using the unoptimized code.
+  Address pc = reinterpret_cast<Address>(output_frame->GetPc());
+  Code* code = Code::cast(Isolate::Current()->heap()->FindCodeObject(pc));
+  source_position_ = code->SourcePosition(pc);
+
   for (int i = 0; i < expression_count_; i++) {
     SetExpression(i, output_frame->GetExpression(i));
   }
@@ -1626,6 +1630,7 @@ DeoptimizedFrameInfo::~DeoptimizedFrameInfo() {
   delete[] parameters_;
 }
 
+
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);