Add usage and collision details to the hash table data structure in order to determine effectivenes…

runtime/vm/precompiler.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/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 1040 matching lines @@
         }
       }
     }
   }
 }
 
 
 class NameFunctionsTraits {
  public:
   static const char* Name() { return "NameFunctionsTraits"; }
+  static bool ReportStats() { return false; }
 
   static bool IsMatch(const Object& a, const Object& b) {
     return a.IsString() && b.IsString() &&
         String::Cast(a).Equals(String::Cast(b));
   }
   static uword Hash(const Object& obj) {
     return String::Cast(obj).Hash();
   }
   static RawObject* NewKey(const String& str) {
     return str.raw();
@@ skipping 1613 matching lines @@
       CompilationPipeline::New(thread->zone(), function);
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   return PrecompileFunctionHelper(pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart