Fix leakage of virtual address space on Linux platform.

src/platform-win32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1395 matching lines @@
 
 VirtualMemory::VirtualMemory(size_t size, size_t alignment)
     : address_(NULL), size_(0) {
   ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
   size_t request_size = RoundUp(size + alignment,
                                 static_cast<intptr_t>(OS::AllocateAlignment()));
   void* address = ReserveRegion(request_size);
   if (address == NULL) return;
   Address base = RoundUp(static_cast<Address>(address), alignment);
   // Try reducing the size by freeing and then reallocating a specific area.
-  ReleaseRegion(address, request_size);
+  bool result = ReleaseRegion(address, request_size);
+  USE(result);
+  ASSERT(result);
   address = VirtualAlloc(base, size, MEM_RESERVE, PAGE_NOACCESS);
   if (address != NULL) {
     request_size = size;
     ASSERT(base == static_cast<Address>(address));
   } else {
     // Resizing failed, just go with a bigger area.
     address = ReserveRegion(request_size);
     if (address == NULL) return;
   }
   address_ = address;
@@ skipping 604 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal