Improve checked mode a little (more to come in a different CL).

runtime/vm/object.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/object.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 5950 matching lines @@
   VariableDescAddr(scope_index)->context_level = Smi::New(context_level);
 }
 
 
 const char* ContextScope::ToCString() const {
   return "ContextScope";
 }
 
 
 const char* ICData::ToCString() const {
-  return "ICData";
+  const char* kFormat = "ICData target:%s";
+  const String& name = String::Handle(target_name());
+  intptr_t len = OS::SNPrint(NULL, 0, kFormat, name.ToCString()) + 1;
+  char* chars = reinterpret_cast<char*>(
+      Isolate::Current()->current_zone()->Allocate(len));
+  OS::SNPrint(chars, len, kFormat, name.ToCString());
+  return chars;
 }
 
 
 void ICData::set_function(const Function& value) const {
   raw_ptr()->function_ = value.raw();
 }
 
 
 void ICData::set_target_name(const String& value) const {
   raw_ptr()->target_name_ = value.raw();
@@ skipping 2981 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart