Lazily generate local var descriptors.

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 460 matching lines @@
     if (code().is_optimized()) {
       Thread* thread = Thread::Current();
       Zone* zone = thread->zone();
       const Error& error = Error::Handle(zone,
           Compiler::EnsureUnoptimizedCode(thread, function()));
       if (!error.IsNull()) {
         Exceptions::PropagateError(error);
       }
     }
     var_descriptors_ =
-        Code::Handle(function().unoptimized_code()).var_descriptors();
+        Code::Handle(function().unoptimized_code()).GetLocalVarDescriptors();
     ASSERT(!var_descriptors_.IsNull());
   }
 }
 
 
 bool ActivationFrame::IsDebuggable() const {
   return Debugger::IsDebuggable(function());
 }
 
 
@@ skipping 2198 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart