* doc/extend.texi: Mention __float128 support on hppa HP-UX.
	* config/pa/pa-hpux.h (HPUX_LONG_DOUBLE_LIBRARY): Define to 1.
	* config/pa/pa.c (pa_expand_builtin): New.  Include "langhooks.h".
	(pa_c_mode_for_suffix): New.
	(TARGET_EXPAND_BUILTIN): Define.
	(TARGET_C_MODE_FOR_SUFFIX): Define.
	(pa_builtins): Define.
	(pa_init_builtins): Register __float128 type and init new support
	builtins.
	* config/pa/pa.h (HPUX_LONG_DOUBLE_LIBRARY): Define if not defined.
	* config/pa/quadlib.c (_U_Qfcopysign): New.

From-SVN: r168969