* cpphash.c: Fix formatting, update commentary.
	(dump_definition): Take three separate arguments instead of a
	MACRODEF structure argument.
	* cpphash.h: Update prototype of dump_definition.
	* cppinit.c (cpp_finish): Update call of dump_definition.

	* cpplib.c (do_define): Always create new hash entry with
	T_MACRO type.  Remove redundant check for redefinition of
	poisoned identifier.  Update call of dump_definition.
	(do_undef): Don't call check_macro_name.  Rename sym_length to
	len.
	(do_error, do_warning): Don't use copy_rest_of_line or
	SKIP_WHITE_SPACE.
	(do_warning): Don't use pedwarn for the actual warning,
	only the notice about its not being in the standard.  (Fixes
	bug with #warning in system headers.)
	(do_ident): Stricter argument checking - accept only a single
	string after #ident.  Also, macro-expand the line.
	(do_xifdef): Use cpp_defined.  De-obfuscate.

	(do_pragma): Split out specific pragma handling to separate
	functions.  Use get_directive_token.  Update commentary.  Do
	not pass on #pragma once or #pragma poison to the front end.
	(do_pragma_once, do_pragma_implementation, do_pragma_poison,
	do_pragma_default): New.

From-SVN: r31931