Add small test for tcmalloc

Currently there is a crash on Windows when the allocation hooks
in tcmalloc is used. The crash manifests itself when CreateThread
is called (causing a callback into the hook and we're calling
mc_get_allocation_size)

Change-Id: Idd0e1ba0a4cd21eed056a424f5c7a65fc6c5f1da
Reviewed-on: http://review.couchbase.org/37061
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>