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Subject/proc visibility patch breaks GDB, etc.

In fs/proc/base.c:proc_pid_lookup(), the patch

read_unlock(&tasklist_lock);
if (!task)
goto out;
+ if (!thread_group_leader(task))
+ goto out_drop_task;
inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
means that threads other than the thread group leader don't appear in
the /proc top-level directory. Programs that are informed via pid of
events can no longer find the appropriate process -- for example,
using gdb on a multi-threaded process, or profiling using perfmon.

The immediate symptom is GDB saying:
Could not open /proc/757/status
when 757 is a TID not a PID.

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