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

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
index 49a7adf6fca9eca089c1198496bd60b00a1dd748..d9efa8322675a962d8558acf7d1b3d882c622718 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
@@ -249,10 +249,6 @@ class IRTracer extends TracerUtil implements cps_ir.Visitor {
     return "Identical($left, $right)";
   }
 
-  visitInterceptor(cps_ir.Interceptor node) {
-    return "Interceptor(${node.input})";
-  }
-
   visitThis(cps_ir.This node) {
     return "This";
   }