[dev.ssa] cmd/compile: print aux value also

When printing a value with just an aux, print the aux as well. Debugging
cse is easier when the aux values are visible.

Change-Id: Ifaf96bdb25462c9df7ba01fdfdbf0d379631f555
Reviewed-on: https://go-review.googlesource.com/19476Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/ssa/value.go

@@ -113,6 +113,10 @@ func (v *Value) LongString() string {
 		s += fmt.Sprintf(" [%g]", v.AuxFloat())
 	case auxString:
 		s += fmt.Sprintf(" {%s}", v.Aux)
+	case auxSym:
+		if v.Aux != nil {
+			s += fmt.Sprintf(" {%s}", v.Aux)
+		}
 	case auxSymOff:
 		if v.Aux != nil {
 			s += fmt.Sprintf(" {%s}", v.Aux)