Cleanup timeline stream enabled flag so that it can be easily tested from an intrinsic

runtime/vm/deopt_instructions.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/deopt_instructions.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/intermediate_language.h"
@@ skipping 123 matching lines @@
   // Delete all deferred objects.
   for (intptr_t i = 0; i < deferred_objects_count_; i++) {
     delete deferred_objects_[i];
   }
   delete[] deferred_objects_;
   deferred_objects_ = NULL;
   deferred_objects_count_ = 0;
   if (FLAG_support_timeline && (deopt_start_micros_ != 0)) {
     TimelineStream* compiler_stream = Timeline::GetCompilerStream();
     ASSERT(compiler_stream != NULL);
-    if (compiler_stream->Enabled()) {
+    if (compiler_stream->enabled()) {
       // Allocate all Dart objects needed before calling StartEvent,
       // which blocks safe points until Complete is called.
       const Code& code = Code::Handle(zone(), code_);
       const Function& function = Function::Handle(zone(), code.function());
       const String& function_name =
           String::Handle(zone(), function.QualifiedScrubbedName());
       const char* reason = DeoptReasonToCString(deopt_reason());
       const int counter = function.deoptimization_counter();
       TimelineEvent* timeline_event = compiler_stream->StartEvent();
       if (timeline_event != NULL) {
@@ skipping 1164 matching lines @@
                           Smi* offset,
                           TypedData* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart