Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/base/elf_mem_image.cc

 // Copyright (c) 2008, Google Inc.
 // 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
@@ skipping 19 matching lines @@
 // ---
 // Author: Paul Pluzhnikov
 //
 // Allow dynamic symbol lookup in an in-memory Elf image.
 //
 
 #include "base/elf_mem_image.h"
 
 #ifdef HAVE_ELF_MEM_IMAGE  // defined in elf_mem_image.h
 
+#include <stddef.h>   // for size_t, ptrdiff_t
 #include "base/logging.h"
 
 // From binutils/include/elf/common.h (this doesn't appear to be documented
 // anywhere else).
 //
 //   /* This flag appears in a Versym structure.  It means that the symbol
 //      is hidden, and is only visible with an explicit version number.
 //      This is a GNU extension.  */
 //   #define VERSYM_HIDDEN           0x8000
 //
@@ skipping 373 matching lines @@
   }
   info_.name    = symbol_name;
   info_.version = version_name;
   info_.address = image->GetSymAddr(symbol);
   info_.symbol  = symbol;
 }
 
 }  // namespace base
 
 #endif  // HAVE_ELF_MEM_IMAGE