c-pch.c: Include langhooks.h.

c-pch.c: Include langhooks.h.

	* c-pch.c: Include langhooks.h.
	(IDENT_LENGTH): New.
	(get_ident): New.
	(pch_ident): Delete.
	(pch_init): Use get_ident, IDENT_LENGTH.
	(c_common_valid_pch): Likewise.  Also, use actual language
	in warning message.
	* Makefile.in (c-pch.o): Add langhooks.h to dependencies.

	* objc/config-lang.in (gtfiles): Add objc-act.c.  Remove duplicate
	c-parse.in.
	* objc/Make-lang.in (objc/objc-act.o): Add dependency on
	gt-objc-objc-act.h.
	(gt-objc-objc-act.h): New rule.
	* objc/lang-specs.h: Support PCH.
	* objc/objc-act.c: Include gt-objc-objc-act.h.
	(objc_add_static_instance): Move num_static_inst out, mark for PCH.
	(build_selector_reference_decl): Move idx out, mark for PCH.
	(build_class_reference_decl): Likewise.
	(build_objc_string_decl): Move *_idx out, mark for PCH.
	(build_tmp_function_decl): Move xxx out, mark for PCH.

From-SVN: r63924