[dev.ssa] cmd/compile: always print block control values

They were being omitted after scheduling.

Change-Id: Ia20e2dcb61fde9ec854918b958c3897bafd282a6
Reviewed-on: https://go-review.googlesource.com/13140
Reviewed-by: Keith Randall <khr@golang.org>

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

@@ -42,6 +42,7 @@ func fprintFunc(w io.Writer, f *Func) {
 				fmt.Fprintln(w, v.LongString())
 				printed[v.ID] = true
 			}
+			fmt.Fprintln(w, "    "+b.LongString())
 			continue
 		}