20000625-1.c, [...]: New tests.

20000625-1.c, [...]: New tests.

	* gcc.dg/20000625-1.c, gcc.dg/20000625-2.c, gcc.dg/cpp-mi3.c:
        New tests.
	* gcc.dg/cpp-mi3.def: New file.

	* gcc.dg/cpp-as1.c: Also test that macro expansion does not occur
	inside assertions.
	* gcc.dg/cpp-as2.c: Make error regexps match either old or new
	lexer's error messages.
	* gcc.dg/cpp-mi.c: Use -H and examine the output, don't try to
	divine anything from the linemarkers.
	* gcc.dg/cpp-micc.h: Fix typo (declare int b, not int a);
	* gcc.dg/poison-1.c: Preprocess only; apply -fno-show-column.

From-SVN: r34701