Introduce gdbarch_num_cooked_regs

The expression

  gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch)

is used quite often to find the number of cooked registers (raw + pseudo
registers).  This patch introduces gdbarch_num_cooked_regs, which does
the equivalent.  It substantially reduces required wrapping in some
places, so should improve readability.

There is a for loop in m68hc11_frame_unwind_cache that had iterated
until (the equivalent of) gdbarch_num_cooked_regs (gdbarch) - 1.  During
review, we concluded that this is most likely an off-by-one mistake, so
I replaced it with gdbarch_num_cooked_regs (gdbarch).

gdb/ChangeLog:

	* gdbarch.sh (gdbarch_num_cooked_regs): New.
	* gdbarch.h: Re-generate.
	* ax-gdb.c (gen_expr): Use gdbarch_num_cooked_regs.
	* dwarf2-frame.c (dwarf2_frame_cache): Likewise.
	* eval.c (evaluate_subexp_standard): Likewise.
	* findvar.c (value_of_register): Likewise.
	(value_of_register_lazy): Likewise.
	(address_from_register): Likewise.
	* frame.c (get_frame_register_bytes): Likewise.
	* gdbarch-selftests.c (register_to_value_test): Likewise.
	* h8300-tdep.c (h8300_register_type): Likewise.
	* i386-tdep.c (i386_dbx_reg_to_regnum): Likewise.
	(i386_svr4_reg_to_regnum): Likewise.
	* infcmd.c (default_print_registers_info): Likewise.
	(registers_info): Likewise.
	(print_vector_info): Likewise.
	(default_print_float_info): Likewise.
	* m68hc11-tdep.c (m68hc11_frame_unwind_cache): Likewise.
	* mdebugread.c (mdebug_reg_to_regnum): Likewise.
	* mi/mi-main.c (mi_cmd_data_list_register_names): Likewise.
	(mi_cmd_data_list_changed_registers): Likewise.
	(mi_cmd_data_list_register_values): Likewise.
	(mi_cmd_data_write_register_values): Likewise.
	(mi_cmd_trace_frame_collected): Likewise.
	* mips-tdep.c (print_gp_register_row): Likewise.
	(mips_print_registers_info): Likewise.
	* nds32-tdep.c (nds32_gdbarch_init): Likewise.
	* regcache.c (init_regcache_descr): Likewise.
	(register_size): Likewise.
	(register_dump::dump): Likewise.
	(cooked_read_test): Likewise.
	(cooked_write_test): Likewise.
	* rs6000-tdep.c (rs6000_register_sim_regno): Likewise.
	(rs6000_gdbarch_init): Likewise.
	* stabsread.c (stab_reg_to_regnum): Likewise.
	* stack.c (info_frame_command): Likewise.
	* target-descriptions.c (tdesc_register_name): Likewise.
	* trad-frame.c (trad_frame_alloc_saved_regs): Likewise.
	* tui/tui-regs.c (tui_show_register_group): Likewise.
	* user-regs.c (user_reg_map_name_to_regnum): Likewise.
	(user_reg_map_regnum_to_name): Likewise.
	(value_of_user_reg): Likewise.
	(maintenance_print_user_registers): Likewise.
	* xtensa-tdep.c (xtensa_find_register_by_name): Likewise.
	(xtensa_register_name): Likewise.
	(xtensa_register_type): Likewise.
	(xtensa_reg_to_regnum): Likewise.
	(xtensa_pseudo_register_read): Likewise.
	(xtensa_pseudo_register_write): Likewise.

gdb/regcache.c

@@ -86,8 +86,7 @@ init_regcache_descr (struct gdbarch *gdbarch)
   /* Total size of the register space.  The raw registers are mapped
      directly onto the raw register cache while the pseudo's are
      either mapped onto raw-registers or memory.  */
-  descr->nr_cooked_registers = gdbarch_num_regs (gdbarch)
-			       + gdbarch_num_pseudo_regs (gdbarch);
+  descr->nr_cooked_registers = gdbarch_num_cooked_regs (gdbarch);
 
   /* Fill in a table of register types.  */
   descr->register_type
@@ -163,9 +162,7 @@ register_size (struct gdbarch *gdbarch, int regnum)
   struct regcache_descr *descr = regcache_descr (gdbarch);
   int size;
 
-  gdb_assert (regnum >= 0
-	      && regnum < (gdbarch_num_regs (gdbarch)
-			   + gdbarch_num_pseudo_regs (gdbarch)));
+  gdb_assert (regnum >= 0 && regnum < gdbarch_num_cooked_regs (gdbarch));
   size = descr->sizeof_register[regnum];
   return size;
 }
@@ -1311,8 +1308,7 @@ register_dump::dump (ui_file *file)
   long register_offset = 0;
 
   gdb_assert (descr->nr_cooked_registers
-	      == (gdbarch_num_regs (m_gdbarch)
-		  + gdbarch_num_pseudo_regs (m_gdbarch)));
+	      == gdbarch_num_cooked_regs (m_gdbarch));
 
   for (regnum = -1; regnum < descr->nr_cooked_registers; regnum++)
     {
@@ -1637,9 +1633,7 @@ cooked_read_test (struct gdbarch *gdbarch)
   mock_target.reset ();
   /* Then, read all raw and pseudo registers, and don't expect calling
      to_{fetch,store}_registers.  */
-  for (int regnum = 0;
-       regnum < gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
-       regnum++)
+  for (int regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++)
     {
       if (register_size (gdbarch, regnum) == 0)
 	continue;
@@ -1665,9 +1659,7 @@ cooked_read_test (struct gdbarch *gdbarch)
      readonly regcache.  */
   mock_target.reset ();
 
-  for (int regnum = 0;
-       regnum < gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
-       regnum++)
+  for (int regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++)
     {
       if (register_size (gdbarch, regnum) == 0)
 	continue;
@@ -1762,8 +1754,7 @@ cooked_write_test (struct gdbarch *gdbarch)
 
   readwrite_regcache readwrite (gdbarch);
 
-  const int num_regs = (gdbarch_num_regs (gdbarch)
-			+ gdbarch_num_pseudo_regs (gdbarch));
+  const int num_regs = gdbarch_num_cooked_regs (gdbarch);
 
   for (auto regnum = 0; regnum < num_regs; regnum++)
     {