[dev.ssa] cmd/compile: update opnames

This claims to be autogenerated from go tool dist,
but I don't see where.

In any case, the update is trivial.

Change-Id: I58daaba755f3d34a0396005046b89411a02ada7e
Reviewed-on: https://go-review.googlesource.com/13584Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/opnames.go

@@ -159,5 +159,9 @@ var opnames = []string{
 	OLROT:            "LROT",
 	ORROTC:           "RROTC",
 	ORETJMP:          "RETJMP",
+	OPS:              "OPS",
+	OPC:              "OPC",
+	OSQRT:            "OSQRT",
+	OGETG:            "OGETG",
 	OEND:             "END",
 }