[turbofan] cleanup InstructionSequence

src/compiler/code-generator.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_CODE_GENERATOR_H_
 #define V8_COMPILER_CODE_GENERATOR_H_
 
 #include <deque>
 
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/instruction.h"
 #include "src/deoptimizer.h"
 #include "src/macro-assembler.h"
 #include "src/safepoint-table.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Generates native code for a sequence of instructions.
 class CodeGenerator FINAL : public GapResolver::Assembler {
  public:
-  explicit CodeGenerator(InstructionSequence* code);
+  explicit CodeGenerator(Frame* frame, Linkage* linkage,
+                         InstructionSequence* code);
 
   // Generate native code.
   Handle<Code> GenerateCode();
 
   InstructionSequence* code() const { return code_; }
-  Frame* frame() const { return code()->frame(); }
+  Frame* frame() const { return frame_; }
   Isolate* isolate() const { return zone()->isolate(); }
-  Linkage* linkage() const { return code()->linkage(); }
+  Linkage* linkage() const { return linkage_; }
 
  private:
   MacroAssembler* masm() { return &masm_; }
   GapResolver* resolver() { return &resolver_; }
   SafepointTableBuilder* safepoints() { return &safepoints_; }
   Zone* zone() const { return code()->zone(); }
 
   // Checks if {block} will appear directly after {current_block_} when
   // assembling code, in which case, a fall-through can be used.
   bool IsNextInAssemblyOrder(BasicBlock::RpoNumber block) const {
@@ skipping 67 matching lines @@
         : bailout_id_(bailout_id),
           translation_id_(translation_id),
           pc_offset_(pc_offset) {}
 
    private:
     BailoutId bailout_id_;
     int translation_id_;
     int pc_offset_;
   };
 
-  InstructionSequence* code_;
+  Frame* const frame_;
+  Linkage* const linkage_;
+  InstructionSequence* const code_;
   BasicBlock::RpoNumber current_block_;
   SourcePosition current_source_position_;
   MacroAssembler masm_;
   GapResolver resolver_;
   SafepointTableBuilder safepoints_;
   ZoneDeque<DeoptimizationState*> deoptimization_states_;
   ZoneDeque<Handle<Object> > deoptimization_literals_;
   TranslationBuffer translations_;
   int last_lazy_deopt_pc_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_H