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/ThreadPlanStepRange.cpp b/source/Target/ThreadPlanStepRange.cpp
index afc9773..2b0c0c7 100644
--- a/source/Target/ThreadPlanStepRange.cpp
+++ b/source/Target/ThreadPlanStepRange.cpp
@@ -62,10 +62,10 @@
 {
     // We don't explain signals or breakpoints (breakpoints that handle stepping in or
     // out will be handled by a child plan.
-    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();
 
         switch (reason)
         {