Refactor 'dart:profiler' UserTag API

runtime/vm/intrinsifier_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 395 matching lines @@
 void Intrinsifier::UserTag_makeCurrent(Assembler* assembler) {
   return;
 }
 
 
 void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
   return;
 }
 
 
-void Intrinsifier::Profiler_clearCurrentTag(Assembler* assembler) {
+void Intrinsifier::UserTag_defaultTag(Assembler* assembler) {
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64