Revert "dart2js cps: 'is' checks on types with type arguments."

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
index fe216b17377bc80c77477838d2a9ab97b6fb57d4..c2e67b79e046a8c5be4abdd3ad8bf05495631959 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
@@ -330,14 +330,13 @@ class LiteralMap extends Expression {
   }
 }
 
+/// Given the interceptor for a value, test the value against a type.
 class TypeOperator extends Expression {
-  Expression value;
+  Expression receiver;
   final DartType type;
-  final List<Expression> typeArguments;
   final bool isTypeTest;
 
-  TypeOperator(this.value, this.type, this.typeArguments,
-               {bool this.isTypeTest});
+  TypeOperator(this.receiver, this.type, {bool this.isTypeTest});
 
   accept(ExpressionVisitor visitor) => visitor.visitTypeOperator(this);
   accept1(ExpressionVisitor1 visitor, arg) {
@@ -1158,8 +1157,7 @@ abstract class RecursiveVisitor implements StatementVisitor, ExpressionVisitor {
   }
 
   visitTypeOperator(TypeOperator node) {
-    visitExpression(node.value);
-    node.typeArguments.forEach(visitExpression);
+    visitExpression(node.receiver);
   }
 
   visitFunctionExpression(FunctionExpression node) {
@@ -1351,8 +1349,7 @@ class RecursiveTransformer extends Transformer {
   }
 
   visitTypeOperator(TypeOperator node) {
-    node.value = visitExpression(node.value);
-    _replaceExpressions(node.typeArguments);
+    node.receiver = visitExpression(node.receiver);
     return node;
   }