* c-lex.c (c_lex): Replace tok.val.aux with tok.val.c or
	tok.val.arg_no as appropriate.
	* cppexp.c (lex): Similarly.
	* cpplex.c (_cpp_lex_token, cpp_spell_token, cpp_output_token,
	cpp_equiv_tokens, cpp_can_paste, cpp_avoid_paste): Similarly.
	* cppmacro.c (stringify_arg, replace_args, lex_expansion_token,
	cpp_macro_definition): Similarly.
	* cpplib.h (struct cpp_token): Replace aux with c and arg_no.

From-SVN: r37276