Define NO_TLS on ia64. The dynamic TLS implementation on ia64 is

broken for non-threaded shared processes in that __tls_get_addr()
assumes the thread pointer is always initialized. This is not the
case. When arenas_map is referenced in choose_arena() and it is
defined as a thread-local variable, it will result in a SIGSEGV.

PR: ia64/91846 (describes the TLS/ia64 bug).

lib/libc/stdlib/malloc.c

@@ -216,6 +216,7 @@ __FBSDID("$FreeBSD$");
 #ifdef __ia64__
 #  define QUANTUM_2POW_MIN	4
 #  define SIZEOF_PTR		8
+#  define NO_TLS
 #endif
 #ifdef __alpha__
 #  define QUANTUM_2POW_MIN	4