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cc: improve (non-) side effect detection (thanks charle)

--- a/sys/src/cmd/cc/sub.c

+++ b/sys/src/cmd/cc/sub.c

@@ -914,6 +914,10 @@

 	case ONOT:

 	case OADDR:

 	case OIND:

+	case OCOM:

+	case ONEG:

+	case OPOS:

+	case OTST:

 		n = n->left;

 		goto loop;