[PATCH master/7.12] PR 20627: Use resume_stop to stop lwp

[Yao Qi <qiyaoltc@gmail.com>]

Commit 049a8570 (Use target_continue{,_no_signal} instead of target_resume)
replaces the code stopping lwp with target_continue_no_signal in
target_stop_and_wait, like this,

-  resume_info.thread = ptid;
-  resume_info.kind = resume_stop;
-  resume_info.sig = GDB_SIGNAL_0;
-  (*the_target->resume) (&resume_info, 1);
+  target_continue_no_signal (ptid);

the replacement is not equivalent, and it causes PR 20627.  This patch
is just to revert that change.

Regression testing it on x86_64-linux.

gdb/gdbserver:

2016-09-28  Yao Qi  <yao.qi@linaro.org>

	PR gdbserver/20627
	* target.c (target_stop_and_wait): Don't call
	target_continue_no_signal, use resume_stop instead.
---
 gdb/gdbserver/target.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gdb/gdbserver/target.c b/gdb/gdbserver/target.c
index cf3da47..fd7c714 100644
--- a/gdb/gdbserver/target.c
+++ b/gdb/gdbserver/target.c
@@ -248,8 +248,12 @@ target_stop_and_wait (ptid_t ptid)
 {
   struct target_waitstatus status;
   int was_non_stop = non_stop;
+  struct thread_resume resume_info;
 
-  target_continue_no_signal (ptid);
+  resume_info.thread = ptid;
+  resume_info.kind = resume_stop;
+  resume_info.sig = GDB_SIGNAL_0;
+  (*the_target->resume) (&resume_info, 1);
 
   non_stop = 1;
   mywait (ptid, &status, 0, 0);
-- 
1.9.1