Remove global pretenuring mode.

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_H_
 #define V8_HEAP_H_
 
 #include <cmath>
 
 #include "allocation.h"
@@ skipping 1016 matching lines @@
   // Support for the API.
   //
 
   void CreateApiObjects();
 
   // Adjusts the amount of registered external memory.
   // Returns the adjusted value.
   inline int64_t AdjustAmountOfExternalAllocatedMemory(
       int64_t change_in_bytes);
 
-  // Returns the allocation mode (pre-tenuring) based on observed promotion
-  // rates of previous collections.
-  inline PretenureFlag GetPretenureMode() {
-    return FLAG_pretenuring ? TENURED : NOT_TENURED;
-  }
-
   inline intptr_t PromotedTotalSize() {
     int64_t total = PromotedSpaceSizeOfObjects() + PromotedExternalMemorySize();
     if (total > kMaxInt) return static_cast<intptr_t>(kMaxInt);
     if (total < 0) return 0;
     return static_cast<intptr_t>(total);
   }
 
   inline intptr_t OldGenerationSpaceAvailable() {
     return old_generation_allocation_limit_ - PromotedTotalSize();
   }
@@ skipping 1713 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_