gdb: make inferior::clear_thread_list always silent

After this commit:

  commit a78ef8757418105c35685c5d82b9fdf79459321b
  Date:   Wed Jun 22 18:10:00 2022 +0100

      Always emit =thread-exited notifications, even if silent

The function mi_interp::on_thread_exited (or mi_thread_exit as the
function was called back then) no longer makes use of the "silent"
parameter.

As a result there is no difference between inferior::clear_thread_list
with silent true or false, because:

  - None of the interpreter ::on_thread_exited functions rely on the
    silent parameter, and

  - None of GDB's thread_exit observers rely on the silent parameter
  either.

This commit removes the silent parameter from
inferior::clear_thread_list, and makes the function always silent.

This commit was originally part of a larger series:

  https://inbox.sourceware.org/gdb-patches/20221212203101.1034916-1-pedro@palves.net/

But didn't really need to be part of that series.  I had an interest
in seeing this patch merged:

  https://inbox.sourceware.org/gdb-patches/20221212203101.1034916-31-pedro@palves.net/

Which also didn't really need to be part of the larger series, but
does depend, at least a little, on this commit.  In order to get the
fix I'm interested in merged quicker, I (Andrew Burgess) have rebased
this commit outside of the original series.  Any bugs introduced while
splitting this patch out and rebasing, are entirely my own.

There should be no user visible changes after this commit.

Co-Authored-By: Andrew Burgess <aburgess@redhat.com>

3 files changed, 9 insertions, 10 deletions

diff --git a/gdb/inferior.c b/gdb/inferior.c
index eee4785..7220b70 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -247,13 +247,13 @@ inferior::find_thread (ptid_t ptid)
 /* See inferior.h.  */
 
 void
-inferior::clear_thread_list (bool silent)
+inferior::clear_thread_list ()
 {
   thread_list.clear_and_dispose ([=] (thread_info *thr)
     {
-      threads_debug_printf ("deleting thread %s, silent = %d",
-			    thr->ptid.to_string ().c_str (), silent);
-      set_thread_exited (thr, silent);
+      threads_debug_printf ("deleting thread %s",
+			    thr->ptid.to_string ().c_str ());
+      set_thread_exited (thr, true /* silent */);
       if (thr->deletable ())
 	delete thr;
     });
@@ -272,7 +272,7 @@ notify_inferior_removed (inferior *inf)
 void
 delete_inferior (struct inferior *inf)
 {
-  inf->clear_thread_list (true);
+  inf->clear_thread_list ();
 
   auto it = inferior_list.iterator_to (*inf);
   inferior_list.erase (it);
@@ -307,7 +307,7 @@ notify_inferior_disappeared (inferior *inf)
 static void
 exit_inferior_1 (struct inferior *inf, int silent)
 {
-  inf->clear_thread_list (silent);
+  inf->clear_thread_list ();
 
   notify_inferior_disappeared (inf);
 
diff --git a/gdb/inferior.h b/gdb/inferior.h
index 7457835..c8429b8 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -496,9 +496,8 @@ public:
   /* Find (non-exited) thread PTID of this inferior.  */
   thread_info *find_thread (ptid_t ptid);
 
-  /* Delete all threads in the thread list.  If SILENT, exit threads
-     silently.  */
-  void clear_thread_list (bool silent);
+  /* Delete all threads in the thread list, silently.  */
+  void clear_thread_list ();
 
   /* Continuations-related methods.  A continuation is an std::function
      to be called to finish the execution of a command when running
diff --git a/gdb/thread.c b/gdb/thread.c
index 63ed87e..2cb9e5e 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -246,7 +246,7 @@ init_thread_list (void)
   highest_thread_num = 0;
 
   for (inferior *inf : all_inferiors ())
-    inf->clear_thread_list (true);
+    inf->clear_thread_list ();
 }
 
 /* Allocate a new thread of inferior INF with target id PTID and add