Rebase to FSF GDB 7.5.

- Update dlopen to support two variants of glibc (Gary Benson, BZ 669432).

gdb-dlopen-stap-probe-5of7.patch

@@ -0,0 +1,17 @@
+2012-07-19  Gary Benson  <gbenson@redhat.com>
+
+	* solib-svr4.c (svr4_info): Made debug_loader_offset_p a bitfield.
+
+diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
+index c88b9cb..8e41f19 100644
+--- a/gdb/solib-svr4.c
++++ b/gdb/solib-svr4.c
+@@ -113,7 +113,7 @@ struct svr4_info
+   CORE_ADDR debug_base;	/* Base of dynamic linker structures.  */
+ 
+   /* Validity flag for debug_loader_offset.  */
+-  int debug_loader_offset_p;
++  unsigned int debug_loader_offset_p : 1;
+ 
+   /* Load address for the dynamic linker, inferred.  */
+   CORE_ADDR debug_loader_offset;