Merge GDB 7.5.1

gdb/testsuite/gdb.reverse/amd64-tailcall-reverse.c

 /* This testcase is part of GDB, the GNU debugger.
 
-   Copyright 2011-2012 Free Software Foundation, Inc.
+   Copyright 2012 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-asm (".globl f_start");
-asm ("f_start:");
-
 volatile int v;
 
-void
-f (int x)
+static __attribute__ ((noinline, noclone)) void
+g (void)
 {
-  v++;
+  v = 2;
 }
 
-asm (".globl f_end");
-asm ("f_end:");
+static __attribute__ ((noinline, noclone)) void
+f (void)
+{
+  g ();
+}
 
 int
 main (void)
 {
-  f (1);
+  v = 1;
+  f ();
+  v = 3;
   return 0;
 }