Remove redundant typedefs

I was inspired by this patch of Simon's:

https://sourceware.org/pipermail/gdb-patches/2020-November/173522.html

... to remove other typedefs that are no longer necessary now that gdb
uses C++.

I didn't remove absolutely every one -- I didn't touch the tdep files.
However, I removed many of them.  In some cases, I removed an existing
different struct tag.

2020-12-04  Tom Tromey  <tromey@adacore.com>

	* linespec.c (struct linespec_token): Rename; remove typedef.
	* guile/scm-block.c (struct block_smob): Remove typedef.
	(struct block_syms_progress_smob): Likewise.
	* guile/scm-symbol.c (struct symbol_smob): Remove typedef.
	* guile/scm-symtab.c (symtab_smob): Remove typedef.
	(struct sal_smob): Remove typedef.
	* guile/scm-param.c (struct param_smob): Remove typedef.
	* guile/scm-progspace.c (struct pspace_smob): Rename.
	* guile/scm-objfile.c (struct objfile_smob): Rename.
	* guile/scm-iterator.c (struct iterator_smob): Rename.
	* guile/scm-frame.c (struct frame_smob): Rename.
	* guile/scm-arch.c (struct arch_smob): Rename.
	* guile/scm-type.c (struct field_smob): Remove typedef.
	(struct type_smob): Rename.
	* guile/scm-cmd.c (struct command_smob): Remove typedef.
	* guile/scm-ports.c (struct ioscm_memory_port): Remove typedef.
	* guile/scm-value.c (struct value_smob): Remove typedef.
	* guile/scm-lazy-string.c (lazy_string_smob): Remove typedef.
	* guile/guile-internal.h (struct scheme_variable)
	(struct scheme_function, struct scheme_integer_constant)
	(struct gdb_smob, struct chained_gdb_smob)
	(struct eqable_gdb_smob, arch_smob, frame_smob, iterator_smob)
	(objfile_smob, pspace_smob, type_smob): Remove typedef.
	* guile/scm-pretty-print.c (pretty_printer_smob): Remove typedef.
	(struct pretty_printer_worker_smob): Remove typedef.
	* guile/scm-exception.c (struct exception_smob): Remove typedef.
	* python/py-block.c (struct block_object): Remove typedef.
	(block_syms_iterator_object): Update.
	(set_block): Update.
	(block_syms_iterator_object): Remove typedef.
	* python/py-inferior.c (struct membuf_object): Remove typedef.
	* python/py-symtab.c (struct symtab_object): Remove typedef.
	(set_symtab): Update.
	(sal_object): Remove typedef.
	(set_sal): Update.
	* python/py-frame.c (frame_object): Remove typedef.
	* python/py-record-btrace.c (struct btpy_list_object): Remove
	typedef.
	* python/py-arch.c (struct arch_object): Remove typedef.
	* python/py-linetable.c (struct linetable_entry_object)
	(linetable_object, struct ltpy_iterator_object): Remove typedef.
	* python/py-events.h (eventregistry_object): Remove typedef.
	(struct events_object): Remove typedef.
	* python/python-internal.h (gdbpy_breakpoint_object): Remove
	typedef.
	(thread_object): Remove typedef.
	* python/py-progspace.c (pspace_object): Remove typedef.
	* python/py-value.c (struct value_object): Remove typedef.
	* python/py-record.h (recpy_record_object): Remove typedef.
	(struct recpy_element_object): Remove typedef.
	* python/py-lazy-string.c (lazy_string_object): Remove typedef.
	* python/py-objfile.c (objfile_object): Remove typedef.
	* python/py-cmd.c (struct cmdpy_object): Remove typedef.
	* python/py-type.c (type_object): Remove typedef.
	(typy_iterator_object): Update.
	(set_type): Update.
	(field_object): Remove typedef.
	(typy_iterator_object): Remove typedef.
	* python/py-registers.c (register_descriptor_iterator_object):
	Remove typedef.
	(struct register_descriptor_object)
	(struct reggroup_iterator_object, struct reggroup_object): Remove
	typedef.
	* python/py-record.c (recpy_gap_object): Remove typedef.
	* python/py-symbol.c (symbol_object): Remove typedef.
	(set_symbol): Update.
	* python/py-event.h (event_object): Remove typedef.
	* python/py-param.c (parmpy_object): Remove typedef.
	* python/py-instruction.c (struct py_insn_obj): Remove typedef.
	* python/py-unwind.c (struct pending_frame_object): Remove typedef.
	(unwind_info_object, struct cached_frame_info): Likewise.

gdb/python/py-type.c

@@ -28,7 +28,7 @@
 #include "language.h"
 #include "typeprint.h"
 
-typedef struct pyty_type_object
+struct type_object
 {
   PyObject_HEAD
   struct type *type;
@@ -36,35 +36,35 @@ typedef struct pyty_type_object
   /* If a Type object is associated with an objfile, it is kept on a
      doubly-linked list, rooted in the objfile.  This lets us copy the
      underlying struct type when the objfile is deleted.  */
-  struct pyty_type_object *prev;
-  struct pyty_type_object *next;
-} type_object;
+  struct type_object *prev;
+  struct type_object *next;
+};
 
 extern PyTypeObject type_object_type
     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("type_object");
 
 /* A Field object.  */
-typedef struct pyty_field_object
+struct field_object
 {
   PyObject_HEAD
 
   /* Dictionary holding our attributes.  */
   PyObject *dict;
-} field_object;
+};
 
 extern PyTypeObject field_object_type
     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("field_object");
 
 /* A type iterator object.  */
-typedef struct {
+struct typy_iterator_object {
   PyObject_HEAD
   /* The current field index.  */
   int field;
   /* What to return.  */
   enum gdbpy_iter_kind kind;
   /* Pointer back to the original source type object.  */
-  struct pyty_type_object *source;
-} typy_iterator_object;
+  type_object *source;
+};
 
 extern PyTypeObject type_iterator_object_type
     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("typy_iterator_object");
@@ -1101,7 +1101,7 @@ set_type (type_object *obj, struct type *type)
     {
       struct objfile *objfile = TYPE_OBJFILE (type);
 
-      obj->next = ((struct pyty_type_object *)
+      obj->next = ((type_object *)
 		   objfile_data (objfile, typy_objfile_data_key));
       if (obj->next)
 	obj->next->prev = obj;