dart2js cps: Keep interceptors in a separate field.

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_integrity.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_integrity.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_integrity.dart
index 8fb65a2e83840c87a4906edf6436562c63882a11..efdc27f5adbaab71dad06b402d8266ed57afe825 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_integrity.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_integrity.dart
@@ -134,9 +134,13 @@ class CheckCpsIntegrity extends TrampolineRecursiveVisitor {
 
   @override
   visitFunctionDefinition(FunctionDefinition node) {
-    if (node.thisParameter != null) {
-      handleDeclaration(node.thisParameter);
-      enterScope([node.thisParameter]);
+    if (node.interceptorParameter != null) {
+      handleDeclaration(node.interceptorParameter);
+      enterScope([node.interceptorParameter]);
+    }
+    if (node.receiverParameter != null) {
+      handleDeclaration(node.receiverParameter);
+      enterScope([node.receiverParameter]);
     }
     node.parameters.forEach(handleDeclaration);
     enterScope(node.parameters);
@@ -181,6 +185,19 @@ class CheckCpsIntegrity extends TrampolineRecursiveVisitor {
     }
   }
 
+  @override
+  processInvokeMethod(InvokeMethod node) {
+    if (node.callingConvention == CallingConvention.Intercepted) {
+      if (node.interceptorRef == null) {
+        error('No interceptor on intercepted call', node);
+      }
+    } else {
+      if (node.interceptorRef != null) {
+        error('Interceptor on call with ${node.callingConvention}', node);
+      }
+    }
+  }
+
   void checkReferenceChain(Definition def) {
     Reference previous = null;
     for (Reference ref = def.firstRef; ref != null; ref = ref.next) {