Merge tcmalloc r111 (perftools v. 1.8) with the chromium/ branch.

third_party/tcmalloc/chromium/src/malloc_hook_mmap_freebsd.h

 // Copyright (c) 2011, 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 91 matching lines @@
 }
 
 /*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
                                          int flags, int fd, off_t offset) {
   return mmap(start, length, prot, flags, fd, offset);
 }
 
 /*static*/int MallocHook::UnhookedMUnmap(void *start, size_t length) {
   return munmap(start, length);
 }