Fix MI dprintf-insert not printing on a resolved pending location.

This patch fixes the "Format string required" error when trying to print
a dprintf on a now resolved, pending location when set via the MI interface
even if the format string is entered correctly.

This patch also adds a test case to check that issue called
mi-dprintf-pending.exp.

gdb/ChangeLog:

	PR breakpoints/16465
	* breakpoint.c (create_breakpoint): Save extra_string for
	pending breakpoints.

gdb/testsuite/ChangeLog:

	PR breakpoints/16465
	* gdb.mi/mi-dprintf-pending.c: New file.
	* gdb.mi/mi-dprintf-pending.exp: New test.
	* gdb.mi/mi-dprintf-pendshr.c: New file.

1 files changed, 27 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.mi/mi-dprintf-pendshr.c b/gdb/testsuite/gdb.mi/mi-dprintf-pendshr.c
new file mode 100644
index 0000000..05d188c
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-dprintf-pendshr.c
@@ -0,0 +1,27 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2015 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/>.  */
+
+void
+pendfunc1 (void)
+{
+}
+
+void
+pendfunc (void)
+{
+  pendfunc1 ();
+}