Temporary fix for precompile_test

runtime/bin/dartutils.cc

Index: runtime/bin/dartutils.cc
diff --git a/runtime/bin/dartutils.cc b/runtime/bin/dartutils.cc
index be37bc02d316e36b1b53a81db56d785500556f61..62285162604ff2075613f668c6e4d3f2f8907801 100644
--- a/runtime/bin/dartutils.cc
+++ b/runtime/bin/dartutils.cc
@@ -663,8 +663,9 @@ Dart_Handle DartUtils::PrepareBuiltinLibrary(Dart_Handle builtin_lib,
     // Wait for the service isolate to initialize the load port.
     Dart_Port load_port = Dart_ServiceWaitForLoadPort();
     if (load_port == ILLEGAL_PORT) {
-      return Dart_NewUnhandledExceptionError(
-          NewDartUnsupportedError("Service did not return load port."));
+      // TODO(rmacnak): Return an error handle here once precompilation_test
+      // works.
+      return NewDartUnsupportedError("Service did not return load port.");
     }
     result = Builtin::SetLoadPort(load_port);
     RETURN_IF_ERROR(result);