cmd/compile: remove Node.Ntest, Node.Stkdelta

$ sizeof -p cmd/compile/internal/gc Node
Node 272
$

Change-Id: I3d9b67eebfc0be0a4b9768d3de3dc76300abd89c
Reviewed-on: https://go-review.googlesource.com/10521
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index ed5001a..d55b7f7 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -2421,7 +2421,7 @@
 		// generating wrapper from *T to T.
 		n := Nod(OIF, nil, nil)
 
-		n.Ntest = Nod(OEQ, this.Left, nodnil())
+		n.Left = Nod(OEQ, this.Left, nodnil())
 
 		// these strings are already in the reflect tables,
 		// so no space cost to use them here.
@@ -2757,7 +2757,7 @@
 	nx := Nod(OXDOT, p, field)
 	ny := Nod(OXDOT, q, field)
 	nif := Nod(OIF, nil, nil)
-	nif.Ntest = Nod(ONE, nx, ny)
+	nif.Left = Nod(ONE, nx, ny)
 	r := Nod(ORETURN, nil, nil)
 	r.List = list(r.List, Nodbool(false))
 	nif.Nbody = list(nif.Nbody, r)
@@ -2802,7 +2802,7 @@
 	}
 
 	nif := Nod(OIF, nil, nil)
-	nif.Ntest = Nod(ONOT, call, nil)
+	nif.Left = Nod(ONOT, call, nil)
 	r := Nod(ORETURN, nil, nil)
 	r.List = list(r.List, Nodbool(false))
 	nif.Nbody = list(nif.Nbody, r)
@@ -2874,7 +2874,7 @@
 		ny.Bounded = true
 
 		nif := Nod(OIF, nil, nil)
-		nif.Ntest = Nod(ONE, nx, ny)
+		nif.Left = Nod(ONE, nx, ny)
 		r := Nod(ORETURN, nil, nil)
 		r.List = list(r.List, Nodbool(false))
 		nif.Nbody = list(nif.Nbody, r)