Update dummy compiler with new interceptor-related methods

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 06cbf98a637f7abde500ec9e487a2592c6f3d5b4..98e41ed1b94f72e9cf0b324852179fa8bca0b4e1 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -872,9 +872,9 @@ class JavaScriptBackend extends Backend {
         compiler.findHelper(const SourceString('defineNativeMethodsFinish'));
 
     // These methods are overwritten with generated versions.
-    forbidInlining(getInterceptorMethod);
-    forbidInlining(getDispatchPropertyMethod);
-    forbidInlining(setDispatchPropertyMethod);
+    canBeInlined[getInterceptorMethod] = false;
+    canBeInlined[getDispatchPropertyMethod] = false;
+    canBeInlined[setDispatchPropertyMethod] = false;
 
     List<ClassElement> classes = [
       jsInterceptorClass =
@@ -949,14 +949,6 @@ class JavaScriptBackend extends Backend {
     validateInterceptorImplementsAllObjectMethods(jsInterceptorClass);
   }
 
-  void forbidInlining(Element element) {
-    // This guard is needed because the backend is initialized even for
-    // --analyze-only compiles which skip some helper libraries.
-    if (element is FunctionElement) {
-      canBeInlined[element] = false;
-    }
-  }
-
   void validateInterceptorImplementsAllObjectMethods(
       ClassElement interceptorClass) {
     if (interceptorClass == null) return;