Teach the flow graph compiler to play nice with the debugger

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "vm/flags.h"
 #include "vm/intermediate_language.h"
 #include "vm/longjump.h"
 #include "vm/os.h"
@@ skipping 156 matching lines @@
       const AbstractType& type =
           AbstractType::ZoneHandle(
               owner()->parsed_function().function().result_type());
       AssertAssignableComp* assert =
           new AssertAssignableComp(return_value, type);
       AddInstruction(new BindInstr(temp_index(), assert));
       return_value = new TempVal(temp_index());
     }
   }
 
-  AddInstruction(new ReturnInstr(return_value));
+  AddInstruction(new ReturnInstr(return_value, node->token_index()));
   CloseFragment();
 }
 
 void ValueGraphVisitor::VisitReturnNode(ReturnNode* node) { UNREACHABLE(); }
 void TestGraphVisitor::VisitReturnNode(ReturnNode* node) { UNREACHABLE(); }
 
 
 // <Expression> ::= Literal { literal: Instance }
 void EffectGraphVisitor::VisitLiteralNode(LiteralNode* node) {
   return;
@@ skipping 913 matching lines @@
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len));
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart