Fix MIPS build: use stubbed-out TF implementation

test/cctest/compiler/test-pipeline.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/compiler.h"
 #include "src/compiler/pipeline.h"
 #include "src/handles.h"
@@ skipping 12 matching lines @@
   CompilationInfoWithZone info(function);
 
   CHECK(Parser::Parse(&info));
   StrictMode strict_mode = info.function()->strict_mode();
   info.SetStrictMode(strict_mode);
   CHECK(Rewriter::Rewrite(&info));
   CHECK(Scope::Analyze(&info));
   CHECK_NE(NULL, info.scope());
 
   Pipeline pipeline(&info);
+#if V8_TURBOFAN_TARGET
   Handle<Code> code = pipeline.GenerateCode();
-#if V8_TURBOFAN_TARGET
   CHECK(Pipeline::SupportedTarget());
   CHECK(!code.is_null());
 #else
-  USE(code);
+  USE(pipeline);
 #endif
 }