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cc1: Improve message output in expand()

The debug output was too cryptic and addign the meaning of the
printed values helps to identify the state.

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -276,7 +276,8 @@

 	char *arglist[NR_MACROARG];

 	char arguments[INPUTSIZ], buffer[INPUTSIZ];

-	DBG("MACRO '%s' detected %d %d", sym->name, disexpand, sym->hide);

+	DBG("MACRO '%s' detected disexpand=%d hide=%d",

+	    sym->name, disexpand, sym->hide);

 	if (disexpand || sym->hide)

 		return 0;