Set JEMalloc as the default allocator (instead of TCMalloc)...

third_party/tcmalloc/allocator_shim.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <config.h>
 
 // When defined, different heap allocators can be used via an environment
 // variable set before running the program.  This may reduce the amount
 // of inlining that we get with malloc/free/etc.  Disabling makes it
 // so that only tcmalloc can be used.
@@ skipping 17 matching lines @@
 static int new_mode = 0;
 
 typedef enum {
   TCMALLOC,    // TCMalloc is the default allocator.
   JEMALLOC,    // JEMalloc
   WINDEFAULT,  // Windows Heap
   WINLFH,      // Windows LFH Heap
 } Allocator;
 
 // This is the default allocator.
-static Allocator allocator = TCMALLOC;
+static Allocator allocator = JEMALLOC;
 
 // We include tcmalloc and the win_allocator to get as much inlining as
 // possible.
 #include "tcmalloc.cc"
 #include "win_allocator.cc"
 
 // Forward declarations from jemalloc.
 extern "C" {
 void* je_malloc(size_t s);
 void* je_realloc(void* p, size_t s);
@@ skipping 202 matching lines @@
 // to test whether the CRT has been initialized.  Once we've ripped out
 // the allocators from libcmt, we need to provide this definition so that
 // the rest of the CRT is still usable.
 extern "C" void* _crtheap = reinterpret_cast<void*>(1);
 
 #endif  // WIN32
 
 #include "generic_allocators.cc"
 
 }  // extern C