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[cc1] Add comment about possible error in foldunary()

folding cast operator can generate wrong code

--- a/cc1/fold.c

+++ b/cc1/fold.c

@@ -389,6 +389,7 @@

 	case OCAST:

 		if (op != OCAST)

 			return foldcast(np, l);

+		/* TODO: This is wrong: (float)(int) 7.2 */

 		DBG("FOLD unary collapse %d", np->op);

 		np->left = l->left;

 		l->left = NULL;