Revert "cps-ir: Add support for intercepted calls."

pkg/compiler/lib/src/js_backend/codegen/task.dart

Index: pkg/compiler/lib/src/js_backend/codegen/task.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/task.dart b/pkg/compiler/lib/src/js_backend/codegen/task.dart
index e6991622455ecd64726664f6e2801dbe02f118cb..8fc5804447fff39ea8186b5f55bbc199c549af3b 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/task.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/task.dart
@@ -16,8 +16,7 @@ import '../../cps_ir/cps_ir_nodes.dart' as cps;
 import '../../cps_ir/cps_ir_builder.dart';
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../tree/tree.dart' as ast;
-import '../../types/types.dart' show TypeMask, UnionTypeMask, FlatTypeMask,
-    ForwardingTypeMask;
+import '../../types/types.dart' show TypeMask;
 import '../../scanner/scannerlib.dart' as scanner;
 import '../../elements/elements.dart';
 import '../../closure.dart';
@@ -109,27 +108,12 @@ class CspFunctionCompiler implements FunctionCompiler {
     if (cpsNode == null) {
       giveUp('unable to build cps definition of $element');
     }
-    new UnsugarVisitor(glue).rewrite(cpsNode);
+    const UnsugarVisitor().rewrite(cpsNode);
     return cpsNode;
   }
 
   static const Pattern PRINT_TYPED_IR_FILTER = null;
 
-  String formatTypeMask(TypeMask type) {
-    if (type is UnionTypeMask) {
-      return '[${type.disjointMasks.map(formatTypeMask).join(', ')}]';
-    } else if (type is FlatTypeMask) {
-      if (type.isEmpty) {
-        return "null";
-      }
-      String suffix = (type.isExact ? "" : "+") + (type.isNullable ? "?" : "!");
-      return '${type.base.name}$suffix';
-    } else if (type is ForwardingTypeMask) {
-      return formatTypeMask(type.forwardTo);
-    }
-    throw 'unsupported: $type';
-  }
-
   cps.FunctionDefinition optimizeCpsIR(cps.FunctionDefinition cpsNode) {
     // Transformations on the CPS IR.
     traceGraph("IR Builder", cpsNode);
@@ -143,7 +127,7 @@ class CspFunctionCompiler implements FunctionCompiler {
         PRINT_TYPED_IR_FILTER.matchAsPrefix(cpsNode.element.name) != null) {
       String printType(cps.Node node, String s) {
         var type = typePropagator.getType(node);
-        return type == null ? s : "$s:${formatTypeMask(type.type)}";
+        return type == null ? s : "<$type: $s>";
       }
       DEBUG_MODE = true;
       print(new SExpressionStringifier(printType).visit(cpsNode));
@@ -162,7 +146,7 @@ class CspFunctionCompiler implements FunctionCompiler {
   }
 
   tree_ir.FunctionDefinition compileToTreeIR(cps.FunctionDefinition cpsNode) {
-    tree_builder.Builder builder = new tree_builder.Builder(glue, compiler);
+    tree_builder.Builder builder = new tree_builder.Builder(compiler);
     tree_ir.FunctionDefinition treeNode = builder.buildFunction(cpsNode);
     assert(treeNode != null);
     traceGraph('Tree builder', treeNode);