Fix debugger stub patching on x64 architecture

runtime/vm/code_patcher_arm.cc

 // Copyright (c) 2013, 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_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/code_patcher.h"
 
 #include "vm/instructions.h"
@@ skipping 28 matching lines @@
 
 void CodePatcher::PatchInstanceCallAt(uword return_address,
                                       const Code& code,
                                       uword new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   CallPattern call(return_address, code);
   call.SetTargetAddress(new_target);
 }
 
 
+int32_t CodePatcher::GetPoolOffsetAt(uword return_address) {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+void CodePatcher::SetPoolOffsetAt(uword return_address, int32_t offset) {
+  UNIMPLEMENTED();
+}
+
+
 void CodePatcher::InsertCallAt(uword start, uword target) {
   // The inserted call should not overlap the lazy deopt jump code.
   ASSERT(start + CallPattern::kFixedLengthInBytes <= target);
   CallPattern::InsertAt(start, target);
 }
 
 
 uword CodePatcher::GetInstanceCallAt(uword return_address,
                                      const Code& code,
                                      ICData* ic_data) {
@@ skipping 62 matching lines @@
 
 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
   ASSERT(code.ContainsInstructionAt(pc));
   EdgeCounter counter(pc, code);
   return counter.edge_counter();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM