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

test/cctest/compiler/codegen-tester.h

 // 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.
 
 #ifndef V8_CCTEST_COMPILER_CODEGEN_TESTER_H_
 #define V8_CCTEST_COMPILER_CODEGEN_TESTER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/instruction-selector.h"
@@ skipping 50 matching lines @@
   }
 
   void GenerateCode() { Generate(); }
 
  protected:
   virtual byte* Generate() {
     if (code_.is_null()) {
       Schedule* schedule = this->Export();
       CallDescriptor* call_descriptor = this->call_descriptor();
       Graph* graph = this->graph();
-      CompilationInfo info(graph->zone()->isolate(), graph->zone());
-      Linkage linkage(graph->zone(), call_descriptor);
-      Pipeline pipeline(&info);
-      code_ = pipeline.GenerateCodeForMachineGraph(&linkage, graph, schedule);
+      code_ =
+          Pipeline::GenerateCodeForTesting(call_descriptor, graph, schedule);
     }
     return this->code_.ToHandleChecked()->entry();
   }
 
  private:
   MaybeHandle<Code> code_;
 };
 
 
 template <typename ReturnType>
@@ skipping 247 matching lines @@
 
   void Run(RawMachineAssemblerTester<int32_t>* m);
   void RunLeft(RawMachineAssemblerTester<int32_t>* m);
   void RunRight(RawMachineAssemblerTester<int32_t>* m);
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_CODEGEN_TESTER_H_