Make the interpreters be per UI

Make each UI have its own interpreter list, top level interpreter,
current interpreter, etc.  The "interpreter_async" global is not
really specific to an struct interp (it crosses interpreter-exec ...),
so I moved it to "struct ui" directly, while the other globals were
left hidden in interps.c, opaque to the rest of GDB.

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (bpstat_do_actions_1): Access the current UI's
	async field instead of the interpreter_async global.
	* cli/cli-script.c (execute_user_command, while_command)
	(if_command, script_from_file): Likewise.
	* compile/compile.c: Include top.h instead of interps.h.
	(compile_file_command, compile_code_command)
	(compile_print_command): Access the current UI's async field
	instead of the interpreter_async global.
	* guile/guile.c: Include top.h instead of interps.h.
	(guile_repl_command, guile_command, gdbscm_execute_gdb_command):
	Access the current UI's async field instead of the
	interpreter_async global.
	* guile/scm-ports.c: Include top.h instead of interps.h.
	(ioscm_with_output_to_port_worker): Access the current UI's async
	field instead of the interpreter_async global.
	* inf-loop.c (inferior_event_handler): Likewise.
	* infcall.c (run_inferior_call): Likewise.
	* infrun.c (reinstall_readline_callback_handler_cleanup)
	(fetch_inferior_event): Likewise.
	* interps.c (interpreter_async): Delete.
	(struct ui_interp_info): New.
	(get_current_interp_info): New function.
	(interp_list, current_interpreter, top_level_interpreter_ptr):
	Delete.
	(interp_add, interp_set, interp_lookup, interp_ui_out)
	(current_interp_set_logging, interp_set_temp)
	(current_interp_named_p): Adjust to per-UI interpreters.
	(command_interpreter): Delete.
	(command_interp, current_interp_command_loop, interp_quiet_p)
	(interp_exec, interpreter_exec_cmd, interpreter_completer)
	(top_level_interpreter, top_level_interpreter_data): Adjust to
	per-UI interpreters.
	* interps.h (interpreter_async): Delete.
	* main.c (captured_command_loop): Access the current UI's async
	field instead of the interpreter_async global.
	* python/python.c (python_interactive_command, python_command)
	(execute_gdb_command): Likewise.
	* top.c (maybe_wait_sync_command_done, execute_command_to_string):
	Access the current UI's async field instead of the
	interpreter_async global.
	* top.h (struct tl_interp_info): Forward declare.
	(struct ui) <interp_info, async>: New fields.

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