[gdb/build] Fix frame_list position in frame.c

In commit 995a34b1772 ("Guard against frame.c destructors running before
frame-info.c's") the following problem was addressed.

The frame_info_ptr destructor:
...
  ~frame_info_ptr ()
  {
    frame_list.erase (frame_list.iterator_to (*this));
  }
...
uses frame_list, which is a static member of class frame_info_ptr,
instantiated in frame-info.c:
...
intrusive_list<frame_info_ptr> frame_info_ptr::frame_list;
...

Then there's a static frame_info_pointer variable named selected_frame in
frame.c:
...
static frame_info_ptr selected_frame;
...

Because the destructor of selected_frame uses frame_list, its destructor needs
to be called before the destructor of frame_list.

But because they're in different compilation units, the initialization order and
consequently destruction order is not guarantueed.

The commit fixed this by handling the case that the destructor of frame_list
is called first, adding a check on is_linked ():
...
   ~frame_info_ptr ()
   {
-    frame_list.erase (frame_list.iterator_to (*this));
+    /* If this node has static storage, it may be deleted after
+       frame_list.  Attempting to erase ourselves would then trigger
+       internal errors, so make sure we are still linked first.  */
+    if (is_linked ())
+      frame_list.erase (frame_list.iterator_to (*this));
   }
...

However, since then frame_list has been moved into frame.c, and
initialization/destruction order is guarantueed inside a compilation unit.

Revert aforementioned commit, and fix the destruction order problem by moving
frame_list before selected_frame.

Reverting the commit is another way of fixing the already fixed
Wdangling-pointer warning reported in PR build/30413, in a different way than
commit 9b0ccb1ebae ("Pass const frame_info_ptr reference for
skip_[language_]trampoline").

Approved-By: Simon Marchi <simon.marchi@efficios.com>
Tested on x86_64-linux.
PR build/30413
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30413

gdb/frame.c

@@ -1733,6 +1733,13 @@ get_current_frame (void)
 static frame_id selected_frame_id = null_frame_id;
 static int selected_frame_level = -1;
 
+/* See frame.h.  This definition should come before any definition of a static
+   frame_info_ptr, to ensure that frame_list is destroyed after any static
+   frame_info_ptr.  This is necessary because the destructor of frame_info_ptr
+   uses frame_list.  */
+
+intrusive_list<frame_info_ptr> frame_info_ptr::frame_list;
+
 /* The cached frame_info object pointing to the selected frame.
    Looked up on demand by get_selected_frame.  */
 static frame_info_ptr selected_frame;
@@ -3275,10 +3282,6 @@ maintenance_print_frame_id (const char *args, int from_tty)
 
 /* See frame-info-ptr.h.  */
 
-intrusive_list<frame_info_ptr> frame_info_ptr::frame_list;
-
-/* See frame-info-ptr.h.  */
-
 frame_info_ptr::frame_info_ptr (struct frame_info *ptr)
   : m_ptr (ptr)
 {

gdb/frame.h

@@ -254,11 +254,9 @@ public:
 
   ~frame_info_ptr ()
   {
-    /* If this node has static storage, it may be deleted after
-       frame_list.  Attempting to erase ourselves would then trigger
-       internal errors, so make sure we are still linked first.  */
-    if (is_linked ())
-      frame_list.erase (frame_list.iterator_to (*this));
+    /* If this node has static storage, it should be be deleted before
+       frame_list.  */
+    frame_list.erase (frame_list.iterator_to (*this));
   }
 
   frame_info_ptr &operator= (const frame_info_ptr &other)