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cc1: Add debug information about decay

Applying decay can heavily modify the behaviour of some expressions.

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

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

@@ -578,5 +578,6 @@

 	sym = newsym(NS_IDEN, NULL);

 	sym->type = sizettype;

 	sym->u.i = tp->size;

+	DBG("EXPR sizeof %llu", sym->u.i);

 	return constnode(sym);

 }

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

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

@@ -194,6 +194,7 @@

 	switch (tp->op) {

 	case ARY:

+		DBG("EXPR decay ary");

 		tp = tp->type;

 		if (np->op == OPTR) {

 			new = np->left;

@@ -201,14 +202,18 @@

 			new->type = mktype(tp, PTR, 0, NULL);

 			return new;

 		}

+		break;

 	case FTN:

-		new = node(OADDR, mktype(tp, PTR, 0, NULL), np, NULL);

-		if (np->sym && np->sym->flags & (SGLOBAL|SLOCAL|SPRIVATE))

-			new->flags |= NCONST;

-		return new;

+		DBG("EXPR decay function");

+		break;

 	default:

 		return np;

 	}

+

+	new = node(OADDR, mktype(tp, PTR, 0, NULL), np, NULL);

+	if (np->sym && np->sym->flags & (SGLOBAL|SLOCAL|SPRIVATE))

+		new->flags |= NCONST;

+	return new;

 }

 static Node *