Revert "Do not rely on code patching on DBC for lazy deoptimization."

runtime/vm/code_patcher_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"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/code_patcher.h"
 
 #include "vm/flow_graph_compiler.h"
@@ skipping 12 matching lines @@
 
 void CodePatcher::PatchStaticCallAt(uword return_address,
                                     const Code& code,
                                     const Code& new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern call(return_address, code);
   call.SetTargetCode(new_target);
 }
 
 
+void CodePatcher::InsertDeoptimizationCallAt(uword start) {
+  CallPattern::InsertDeoptCallAt(start);
+}
+
+
 RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
                                         const Code& code,
                                         ICData* ic_data) {
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern call(return_address, code);
   if (ic_data != NULL) {
     *ic_data = call.IcData();
   }
   return call.TargetCode();
 }
@@ skipping 62 matching lines @@
                                       NativeFunction* target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   NativeCallPattern call(return_address, code);
   *target = call.native_function();
   return call.target();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC