* debug.cc (makethread): Eliminate unneeded function call.

* miscfuncs.cc (tls_ix): Predefine.
* perthread.h (set_reent): Eliminate.
(get_reent): Ditto.
* winbase.h (my_tlsalloc): Use global stack base pointer.  Set newly allocated
location to NULL.
(my_tlssetvalue): Use global stack base pointer.
(my_tlsgetvalue): Ditto.

winsup/cygwin/perthread.h

@@ -15,27 +15,6 @@ details. */
 struct _reent;
 extern struct _reent reent_data;
 
-extern DWORD *__stackbase __asm__ ("%fs:4");
-
-extern __inline struct _reent *
-get_reent ()
-{
-  DWORD *base = __stackbase - 1;
-
-  if (*base != PTMAGIC)
-    return &reent_data;
-  return (struct _reent *) base[-1];
-}
-
-extern inline void
-set_reent (struct _reent *r)
-{
-  DWORD *base = __stackbase - 1;
-
-  *base = PTMAGIC;
-  base[-1] = (DWORD) r;
-}
-
 #define PER_THREAD_FORK_CLEAR ((void *)0xffffffff)
 class per_thread
 {