Ensure the debugger keeps a reference to code objects

runtime/vm/debugger_arm.cc

 // Copyright (c) 2011, 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/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/debugger.h"
@@ skipping 28 matching lines @@
 
 
 void CodeBreakpoint::PatchCode() {
   ASSERT(!is_enabled_);
   switch (breakpoint_kind_) {
     case PcDescriptors::kIcCall:
     case PcDescriptors::kUnoptStaticCall:
     case PcDescriptors::kRuntimeCall:
     case PcDescriptors::kClosureCall:
     case PcDescriptors::kReturn: {
-      const Code& code =
-          Code::Handle(Function::Handle(function_).unoptimized_code());
+      const Code& code = Code::Handle(code_);
       saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
       CodePatcher::PatchStaticCallAt(pc_, code,
                                      StubCode::BreakpointRuntimeEntryPoint());
       break;
     }
     default:
       UNREACHABLE();
   }
   is_enabled_ = true;
 }
 
 
 void CodeBreakpoint::RestoreCode() {
   ASSERT(is_enabled_);
   switch (breakpoint_kind_) {
     case PcDescriptors::kIcCall:
     case PcDescriptors::kUnoptStaticCall:
     case PcDescriptors::kClosureCall:
     case PcDescriptors::kRuntimeCall:
     case PcDescriptors::kReturn: {
-      const Code& code =
-          Code::Handle(Function::Handle(function_).unoptimized_code());
+      const Code& code = Code::Handle(code_);
       CodePatcher::PatchStaticCallAt(pc_, code, saved_value_);
       break;
     }
     default:
       UNREACHABLE();
   }
   is_enabled_ = false;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM