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7l: support CB[N]Z[W] instructions

--- a/sys/src/cmd/7l/span.c

+++ b/sys/src/cmd/7l/span.c

@@ -285,6 +285,10 @@

 	case ABLT:	return ABGE;

 	case ABGT:	return ABLE;

 	case ABLE:	return ABGT;

+	case ACBZ:	return ACBNZ;

+	case ACBNZ:	return ACBZ;

+	case ACBZW:	return ACBNZW;

+	case ACBNZW:	return ACBZW;

 	}

 	diag("unknown relation: %A", a);

 	return a;