[RFC][PATCH 2/5] [PR gdb/33469] ui_out_redirect_pop: add optional async param

["Dennis Lambe Jr." <malsyned@malsyned.net>]

This is the actual interface used by the mi_interp methods that emit
async records. If called with an async = true, ui_out state related to
field output can be saved and restored along with the output stream.
---
 gdb/ui-out.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/gdb/ui-out.h b/gdb/ui-out.h
index f7d6be2b026..6997895be02 100644
--- a/gdb/ui-out.h
+++ b/gdb/ui-out.h
@@ -463,15 +463,15 @@ class ui_out_redirect_pop
 {
 public:
 
-  ui_out_redirect_pop (ui_out *uiout, ui_file *stream)
-    : m_uiout (uiout)
+  ui_out_redirect_pop (ui_out *uiout, ui_file *stream, bool async = false)
+    : m_uiout (uiout), m_async (async)
   {
-    m_uiout->redirect (stream);
+    m_uiout->redirect (stream, m_async);
   }
 
   ~ui_out_redirect_pop ()
   {
-    m_uiout->redirect (NULL);
+    m_uiout->redirect (NULL, m_async);
   }
 
   ui_out_redirect_pop (const ui_out_redirect_pop &) = delete;
@@ -479,6 +479,7 @@ class ui_out_redirect_pop
 
 private:
   struct ui_out *m_uiout;
+  bool m_async;
 };
 
 struct buffered_streams;
-- 
2.51.0