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-symtab.c

@@ -25,7 +25,7 @@
 #include "objfiles.h"
 #include "block.h"
 
-typedef struct stpy_symtab_object {
+struct symtab_object {
   PyObject_HEAD
   /* The GDB Symbol table structure.  */
   struct symtab *symtab;
@@ -33,9 +33,9 @@ typedef struct stpy_symtab_object {
      a doubly-linked list, rooted in the objfile.  This allows
      invalidation of the underlying struct symtab when the objfile is
      deleted.  */
-  struct stpy_symtab_object *prev;
-  struct stpy_symtab_object *next;
-} symtab_object;
+  symtab_object *prev;
+  symtab_object *next;
+};
 
 extern PyTypeObject symtab_object_type
     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("symtab_object");
@@ -54,7 +54,7 @@ static const struct objfile_data *stpy_objfile_data_key;
       }							 \
   } while (0)
 
-typedef struct salpy_sal_object {
+struct sal_object {
   PyObject_HEAD
   /* The GDB Symbol table structure.  */
   PyObject *symtab;
@@ -64,9 +64,9 @@ typedef struct salpy_sal_object {
      track with a doubly-linked list, rooted in the objfile.  This
      allows invalidation of the underlying struct symtab_and_line
      when the objfile is deleted.  */
-  struct salpy_sal_object *prev;
-  struct salpy_sal_object *next;
-} sal_object;
+  sal_object *prev;
+  sal_object *next;
+};
 
 extern PyTypeObject sal_object_type
     CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("sal_object");
@@ -378,8 +378,8 @@ set_sal (sal_object *sal_obj, struct symtab_and_line sal)
       symtab *symtab = symtab_object_to_symtab (sal_obj->symtab);
 
       sal_obj->next
-	= ((struct salpy_sal_object *) objfile_data (SYMTAB_OBJFILE (symtab),
-						     salpy_objfile_data_key));
+	= ((sal_object *) objfile_data (SYMTAB_OBJFILE (symtab),
+					salpy_objfile_data_key));
       if (sal_obj->next)
 	sal_obj->next->prev = sal_obj;
 
@@ -405,7 +405,7 @@ set_symtab (symtab_object *obj, struct symtab *symtab)
   if (symtab)
     {
       obj->next
-	= ((struct stpy_symtab_object *)
+	= ((symtab_object *)
 	   objfile_data (SYMTAB_OBJFILE (symtab), stpy_objfile_data_key));
       if (obj->next)
 	obj->next->prev = obj;