[compiler] Make OptimizedCompileJob agnostic from backend.

src/compiler/pipeline.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_COMPILER_PIPELINE_H_
 #define V8_COMPILER_PIPELINE_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 class CompilationInfo;
+class OptimizedCompileJob;
 class RegisterConfiguration;
 
 namespace compiler {
 
 class CallDescriptor;
 class Graph;
 class InstructionSequence;
 class Linkage;
 class PipelineData;
 class Schedule;
 
 class Pipeline {
  public:
-  explicit Pipeline(CompilationInfo* info) : info_(info) {}
+  explicit Pipeline(CompilationInfo* info) : info_(info), data_(nullptr) {}
 
   // Run the entire pipeline and generate a handle to a code object.
   Handle<Code> GenerateCode();
 
   // Run the pipeline on a machine graph and generate code. The {schedule} must
   // be valid, hence the given {graph} does not need to be schedulable.
   static Handle<Code> GenerateCodeForCodeStub(Isolate* isolate,
                                               CallDescriptor* call_descriptor,
                                               Graph* graph, Schedule* schedule,
                                               Code::Flags flags,
@@ skipping 10 matching lines @@
                                           InstructionSequence* sequence,
                                           bool run_verifier);
 
   // Run the pipeline on a machine graph and generate code. If {schedule} is
   // {nullptr}, then compute a new schedule for code generation.
   static Handle<Code> GenerateCodeForTesting(CompilationInfo* info,
                                              CallDescriptor* call_descriptor,
                                              Graph* graph,
                                              Schedule* schedule = nullptr);
 
+  // Returns a new compilation job for the given compilation info.
+  static OptimizedCompileJob* NewCompilationJob(CompilationInfo* info);
+
  private:
   // Helpers for executing pipeline phases.
   template <typename Phase>
   void Run();
   template <typename Phase, typename Arg0>
   void Run(Arg0 arg_0);
   template <typename Phase, typename Arg0, typename Arg1>
   void Run(Arg0 arg_0, Arg1 arg_1);
 
   void BeginPhaseKind(const char* phase_kind);
   void RunPrintAndVerify(const char* phase, bool untyped = false);
   Handle<Code> ScheduleAndGenerateCode(CallDescriptor* call_descriptor);
   void AllocateRegisters(const RegisterConfiguration* config,
                          CallDescriptor* descriptor, bool run_verifier);
 
   CompilationInfo* info() const { return info_; }
   Isolate* isolate() const;
 
   CompilationInfo* const info_;
   PipelineData* data_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_PIPELINE_H_