cmd/compile: remove Node.Nincr, Node.Nelse, Node.Initplan

$ sizeof -p cmd/compile/internal/gc Node
Node 288
$

Change-Id: I4e316efa246132b3faa3a892e4fe9c9039250665
Reviewed-on: https://go-review.googlesource.com/10520
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
diff --git a/src/cmd/compile/internal/gc/select.go b/src/cmd/compile/internal/gc/select.go
index 3a28ea3..f5911c4 100644
--- a/src/cmd/compile/internal/gc/select.go
+++ b/src/cmd/compile/internal/gc/select.go
@@ -247,7 +247,7 @@
 
 		typecheck(&r.Ntest, Erv)
 		r.Nbody = cas.Nbody
-		r.Nelse = concat(dflt.Ninit, dflt.Nbody)
+		r.Rlist = concat(dflt.Ninit, dflt.Nbody)
 		sel.Nbody = list1(r)
 		goto out
 	}