Change SBThread::GetExtendedBacktrace to
SBThread::GetExtendedBacktraceThread to make it more clear what is
being returned.

llvm-svn: 194531
diff --git a/lldb/source/API/SBProcess.cpp b/lldb/source/API/SBProcess.cpp
index d690da7..557006f 100644
--- a/lldb/source/API/SBProcess.cpp
+++ b/lldb/source/API/SBProcess.cpp
@@ -1278,7 +1278,7 @@
     if (process_sp && process_sp->GetSystemRuntime())
     {
         SystemRuntime *runtime = process_sp->GetSystemRuntime();
-        std::vector<ConstString> names = runtime->GetExtendedBacktraceTypes();
+        const std::vector<ConstString> &names = runtime->GetExtendedBacktraceTypes();
         if (idx < names.size())
         {
             return names[idx].AsCString();