Fix DBC product build

runtime/vm/stub_code_dbc.cc

 // Copyright (c) 2016, 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_DBC)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/cpu.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/heap.h"
 #include "vm/instructions.h"
 #include "vm/object_store.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/tags.h"
 
 #define __ assembler->
 
 namespace dart {
 
 DEFINE_FLAG(bool, inline_alloc, true, "Inline allocation of objects.");
 DEFINE_FLAG(bool, use_slow_path, false,
     "Set to true for debugging & verifying the slow paths.");
 DECLARE_FLAG(bool, trace_optimized_ic_calls);
-DECLARE_FLAG(int, optimization_counter_threshold);
-DECLARE_FLAG(bool, support_debugger);
-DECLARE_FLAG(bool, lazy_dispatchers);
 
 void StubCode::GenerateLazyCompileStub(Assembler* assembler) {
   __ Compile();
 }
 
 
 // TODO(vegorov) Don't generate this stub.
 void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
   __ Trap();
 }
@@ skipping 15 matching lines @@
 // Print the stop message.
 DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
   OS::Print("Stop message: %s\n", message);
 }
 END_LEAF_RUNTIME_ENTRY
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC