Don't allocate a new handle unnecessarily

runtime/vm/profiler_service.cc

 // Copyright (c) 2015, 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/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
 #include "vm/log.h"
 #include "vm/native_symbol.h"
@@ skipping 2521 matching lines @@
 
 
 const char* ProfileTrieWalker::CurrentToken() {
   if (current_ == NULL) {
     return NULL;
   }
   if (code_trie_) {
     return NULL;
   }
   ProfileFunction* func = profile_->GetFunction(current_->table_index());
-  const Function& function = Function::Handle(func->function()->raw());
+  const Function& function = *(func->function());
   if (function.IsNull()) {
     // No function.
     return NULL;
   }
   const Script& script = Script::Handle(function.script());
   if (script.IsNull()) {
     // No script.
     return NULL;
   }
   const TokenStream& token_stream = TokenStream::Handle(script.tokens());
@@ skipping 192 matching lines @@
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart