Revert "dart2js cps: Add helpers for common IR manipulation."

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 267abcc3500c241b54e184352b1d0828047acf49..44152148716a7d7f89dcd38c424dd8cabb29c78e 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -76,42 +76,6 @@ abstract class InteriorNode extends Node {
 /// [LetMutable].
 abstract class InteriorExpression extends Expression implements InteriorNode {
   Expression get next => body;
-
-  /// Removes this expression from its current position in the IR.
-  ///
-  /// The node can be re-inserted elsewhere or remain orphaned.
-  ///
-  /// If orphaned, the caller is responsible for unlinking all references in
-  /// the orphaned node. Use [Reference.unlink] or [Primitive.destroy] for this.
-  void remove() {
-    assert(parent != null);
-    assert(parent.body == this);
-    assert(body.parent == this);
-    parent.body = body;
-    body.parent = parent;
-    parent = null;
-    body = null;
-  }
-
-  /// Inserts this above [node].
-  ///
-  /// This node must be orphaned first.
-  void insertAbove(InteriorExpression node) {
-    insertBelow(node.parent);
-  }
-
-  /// Inserts this below [node].
-  ///
-  /// This node must be orphaned first.
-  void insertBelow(InteriorNode newParent) {
-    assert(parent == null);
-    assert(body == null);
-    Expression child = newParent.body;
-    newParent.body = this;
-    this.body = child;
-    child.parent = this;
-    this.parent = newParent;
-  }
 }
 
 /// An expression that passes a continuation to a call.
@@ -253,12 +217,6 @@ abstract class Primitive extends Variable<Primitive> {
   bool get hasNoEffectiveUses {
     return effectiveUses.isEmpty;
   }
-
-  /// Unlinks all references contained in this node.
-  void destroy() {
-    assert(hasNoUses);
-    RemovalVisitor.remove(this);
-  }
 }
 
 /// Operands to invocations and primitives are always variables.  They point to