dart2js cps: Streamline expressions and primitives.

pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart

Index: pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
diff --git a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
index f1970de0d0271ade7f88d180aef863f94f5e57c9..01738041a11c13754fe1f4600aa437b673255ee4 100644
--- a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
+++ b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
@@ -574,9 +574,8 @@ class ParentVisitor extends RecursiveVisitor {
     node.value.parent = node;
   }
 
-  processSetMutableVariable(SetMutableVariable node) {
+  processSetMutable(SetMutable node) {
     node.variable.parent = node;
-    node.body.parent = node;
     node.value.parent = node;
   }
 
@@ -623,7 +622,6 @@ class ParentVisitor extends RecursiveVisitor {
   processSetField(SetField node) {
     node.object.parent = node;
     node.value.parent = node;
-    node.body.parent = node;
   }
 
   processGetField(GetField node) {
@@ -635,10 +633,9 @@ class ParentVisitor extends RecursiveVisitor {
 
   processSetStatic(SetStatic node) {
     node.value.parent = node;
-    node.body.parent = node;
   }
 
-  processGetMutableVariable(GetMutableVariable node) {
+  processGetMutable(GetMutable node) {
     node.variable.parent = node;
   }