Change GDB to use frame_info_ptr

This changes GDB to use frame_info_ptr instead of frame_info *
The substitution was done with multiple sequential `sed` commands:

sed 's/^struct frame_info;/class frame_info_ptr;/'
sed 's/struct frame_info \*/frame_info_ptr /g' - which left some
    issues in a few files, that were manually fixed.
sed 's/\<frame_info \*/frame_info_ptr /g'
sed 's/frame_info_ptr $/frame_info_ptr/g' - used to remove whitespace
    problems.

The changed files were then manually checked and some 'sed' changes
undone, some constructors and some gets were added, according to what
made sense, and what Tromey originally did

Co-Authored-By: Bruno Larsen <blarsen@redhat.com>
Approved-by: Tom Tomey <tom@tromey.com>

gdb/python/python-internal.h

@@ -366,7 +366,7 @@ extern enum ext_lang_rc gdbpy_apply_val_pretty_printer
    const struct language_defn *language);
 extern enum ext_lang_bt_status gdbpy_apply_frame_filter
   (const struct extension_language_defn *,
-   struct frame_info *frame, frame_filter_flags flags,
+   frame_info_ptr frame, frame_filter_flags flags,
    enum ext_lang_frame_args args_type,
    struct ui_out *out, int frame_low, int frame_high);
 extern void gdbpy_preserve_values (const struct extension_language_defn *,
@@ -427,7 +427,7 @@ PyObject *block_to_block_object (const struct block *block,
 PyObject *value_to_value_object (struct value *v);
 PyObject *value_to_value_object_no_release (struct value *v);
 PyObject *type_to_type_object (struct type *);
-PyObject *frame_info_to_frame_object (struct frame_info *frame);
+PyObject *frame_info_to_frame_object (frame_info_ptr frame);
 PyObject *symtab_to_linetable_object (PyObject *symtab);
 gdbpy_ref<> pspace_to_pspace_object (struct program_space *);
 PyObject *pspy_get_printers (PyObject *, void *);
@@ -467,7 +467,7 @@ struct value *convert_value_from_python (PyObject *obj);
 struct type *type_object_to_type (PyObject *obj);
 struct symtab *symtab_object_to_symtab (PyObject *obj);
 struct symtab_and_line *sal_object_to_symtab_and_line (PyObject *obj);
-struct frame_info *frame_object_to_frame_info (PyObject *frame_obj);
+frame_info_ptr frame_object_to_frame_info (PyObject *frame_obj);
 struct gdbarch *arch_object_to_gdbarch (PyObject *obj);
 
 /* Convert Python object OBJ to a program_space pointer.  OBJ must be a