libcpp

	PR preprocessor/28227:
	* directives.c (lex_macro_node): Added 'is_def_or_undef'
	argument.
	(do_define): Update.
	(do_undef): Update.
	(do_ifdef): Update.
	(do_ifndef): Update.
gcc/testsuite
	PR preprocessor/28227:
	* gcc.dg/cpp/pr28227.c: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@120731 138bc75d-0d04-0410-961f-82ee72b054a4