* python/python-internal.h (struct language_defn): Declare.

	* python/python-internal.h (struct language_defn): Declare.
	(python_gdbarch, python_language): Likewise.
	(ensure_python_env): Add prototype.
	(make_cleanup_py_restore_gil): Remove prototype.

	* python/python.c: Include "arch-utils.h", "value.h" and "language.h".
	(python_gdbarch, python_language): New global variables.
	(struct python_env): New data type.
	(ensure_python_env, restore_python_env): New functions.
	(eval_python_from_control_command): Call ensure_python_env to
	install current architecture and language.
	(python_command, gdbpy_new_objfile): Likewise.
	* python/python-cmd.c: Include "arch-utils.h" and "language.h".
	(cmdpy_destroyer, cmdpy_function, cmdpy_completer): Call
	ensure_python_env.
	* python/python-type.c (clean_up_objfile_types): Likewise.
	* python/python-objfile.c: Include "language.h".
	(clean_up_objfile): Call ensure_python_env.
	* python/python-prettyprint.c (apply_val_pretty_printer): Likewise.
	(apply_varobj_pretty_printer): Do not call PyGILState_Ensure.
	* varobj.c (varobj_ensure_python_env): New helper function.
	(varobj_get_display_hint, update_dynamic_varobj_children,
	install_default_visualizer, varobj_set_visualizer, free_variable,
	value_get_print_value): Call it.
	(value_get_print_value): Add varobj argument instead of pretty
	printer argument.  Update all callers.

	* python/python-utils.c (py_gil_restore, make_cleanup_py_restore_gil):
	Remove.

	* value.h (internal_function_fn): Add GDBARCH and LANGUAGE argument.
	(call_internal_function): Likewise.
	* value.c (call_internal_function): Likewise.  Pass to handler.
	* eval.c (evaluate_subexp_standard): Update call.
	* python/python-function.c: Include "language.h".
	(fnpy_call): Add GDBARCH and LANGAUAGE arguments and call
	make_cleanup_python_env.

	* python/python-value.c (builtin_type_pyint, builtin_type_pyfloat,
	builtin_type_pylong, builtin_type_pybool, builtin_type_pychar,
	valpy_str): Use python_gdbarch and python_language instead of
	current_gdbarch and current_language.
	* python/python-type.c (typy_lookup_typename): Likewise.