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Add debug information about macro expansion

It is known that the macro expansion process is broken,
so it is useful to have this information for debugging.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -218,6 +218,7 @@

 	char *arglist[NR_MACROARG], arguments[INPUTSIZ], buffer[BUFSIZE];

 	char prevc, c, *bp, *lim, *arg, *s = sym->u.s;

+	fprintf(stderr, "macro %s:%s\n", sym->name, sym->u.s);

 	if (sym == symfile) {

 		sprintf(buffer, "\"%s\"", getfname());

 		goto add_macro;

@@ -231,6 +232,9 @@

 	if ((r = parsepars(arguments, arglist, atoi(s))) < 1)

 		return r;

+	for (int n = 0; n < atoi(s); ++n)

+		fprintf(stderr, "PAR%d:%s\n", n, arglist[n]);

+

 	len = INPUTSIZ-1;

 	bp = buffer;

 	for (prevc = '\0', s += 3; c = *s; prevc = c, ++s) {

@@ -260,6 +264,7 @@

 		}

 	}

 	*bp = '\0';

+	fprintf(stderr, "macro expanded:%s\n", buffer);

 add_macro:

 	addinput(NULL, sym, buffer);

 	return 1;