Fix non stopping breakpoint on newer compilers.

The breakpoint presented in the return statement was not activated while
compiling the test with gcc 4.9.2.  Added a dummy statement to allow the
breakpoint again.

2015-10-14  Walfred Tedeschi  <walfred.tedeschi@intel.com>

gdb/testsuite:

	* i386-mpx-map.c (foo): Add dummy statement to trigger breakpoint.

Change-Id: I5293ca1c7f82a631e1e41cb650c30dd2d09ef3c2
Signed-off-by: Walfred Tedeschi <walfred.tedeschi@intel.com>

gdb/testsuite/gdb.arch/i386-mpx-map.c

@@ -70,8 +70,9 @@ foo (T *p)
 #if defined  __GNUC__ && !defined __INTEL_COMPILER
   __bnd_store_ptr_bounds (x, &x);
 #endif
-
-  return;			/* after-assign */
+  /* Dummy assign.  */
+  x = x + 1;			/* after-assign */
+  return;
 }
 
 int