Fix casting error for receiver of interceptors.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 7ba9e639ae26b994505959249561dcaa81575a0a..cb1a7a29dd287c220a8b3a9e0c70e3d85a50f768 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -17469,6 +17469,16 @@ THREADED_TEST(Regress137496) {
 }
 
 
+THREADED_TEST(Regress149912) {
+  v8::HandleScope scope;
+  LocalContext context;
+  Handle<FunctionTemplate> templ = FunctionTemplate::New();
+  AddInterceptor(templ, EmptyInterceptorGetter, EmptyInterceptorSetter);
+  context->Global()->Set(v8_str("Bug"), templ->GetFunction());
+  CompileRun("Number.prototype.__proto__ = new Bug; var x = 0; x.foo();");
+}
+
+
 #ifndef WIN32
 class ThreadInterruptTest {
  public: