Don't cache the public stop reason, since it can change as plan completion gets processed.  That means GetStopReason needs to return a shared pointer, not a pointer to the thread's cached version.  Also allow the thread plans to get and set the thread private stop reason - that is usually more appropriate for the logic the thread plans need to do.

git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@116892 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Target/ThreadPlanStepInstruction.cpp b/source/Target/ThreadPlanStepInstruction.cpp
index cef481e..a171f1a 100644
--- a/source/Target/ThreadPlanStepInstruction.cpp
+++ b/source/Target/ThreadPlanStepInstruction.cpp
@@ -84,10 +84,10 @@
 bool
 ThreadPlanStepInstruction::PlanExplainsStop ()
 {
-    StopInfo *stop_info = m_thread.GetStopInfo();
-    if (stop_info)
+    StopInfoSP stop_info_sp = GetPrivateStopReason();
+    if (stop_info_sp)
     {
-        StopReason reason = stop_info->GetStopReason();
+        StopReason reason = stop_info_sp->GetStopReason();
         if (reason == eStopReasonTrace || reason == eStopReasonNone)
             return true;
         else