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cc1: Increase macro expansion debug output

This new output shows when the symbols are hided
and when they are unhided.

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

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

@@ -55,6 +55,7 @@

 		fp = NULL;

 		if (hide->hide == UCHAR_MAX)

 			die("cc1: too many macro expansions");

+		DBG("SYM: hidding symbol %s %d\n", hide->name, hide->hide);

 		++hide->hide;

 		flags = IMACRO;

 	} else  if (fname) {

@@ -115,6 +116,7 @@

 		break;

 	case IMACRO:

 		assert(hide->hide == 1);

+		DBG("SYM: unhidding symbol %s %d\n", hide->name, hide->hide);

 		--hide->hide;

 		break;

 	}