[turbofan] add ForTesting to pipeline entry points that are for testing only.

test/cctest/compiler/test-codegen-deopt.cc

 // Copyright 2014 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/code-generator.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
@@ skipping 45 matching lines @@
     graph = new (scope_->main_zone()) Graph(scope_->main_zone());
   }
 
   virtual ~DeoptCodegenTester() {}
 
   void GenerateCodeFromSchedule(Schedule* schedule) {
     OFStream os(stdout);
     if (FLAG_trace_turbo) {
       os << *schedule;
     }
-
-    Linkage* linkage = new (scope_->main_zone()) Linkage(info.zone(), &info);
-    Pipeline pipeline(&info);
-    result_code =
-        pipeline.GenerateCodeForMachineGraph(linkage, graph, schedule);
-
+    result_code = Pipeline::GenerateCodeForTesting(&info, graph, schedule);
 #ifdef OBJECT_PRINT
     if (FLAG_print_opt_code || FLAG_trace_turbo) {
       result_code->Print();
     }
 #endif
   }
 
   Zone* zone() { return scope_->main_zone(); }
 
   HandleAndZoneScope* scope_;
@@ skipping 206 matching lines @@
   Handle<Object> result;
   bool has_pending_exception =
       !Execution::Call(isolate, t.function,
                        isolate->factory()->undefined_value(), 0, NULL,
                        false).ToHandle(&result);
   CHECK(!has_pending_exception);
   CHECK(result->SameValue(Smi::FromInt(42)));
 }
 
 #endif