Shorten live ranges of argument subexpressions.

src/arm/lithium-arm.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1372 matching lines @@
 
   virtual void PrintDataTo(StringStream* stream) const;
 
   Handle<String> name() const {return hydrogen()->name(); }
   int arity() const { return hydrogen()->argument_count() - 1; }
 };
 
 
 class LCallKnownGlobal: public LInstruction {
  public:
+  explicit LCallKnownGlobal(LOperand* receiver) : LUnaryOperation(receiver) { }
+
   DECLARE_CONCRETE_INSTRUCTION(CallKnownGlobal, "call-known-global")
   DECLARE_HYDROGEN_ACCESSOR(CallKnownGlobal)
 
   virtual void PrintDataTo(StringStream* stream) const;
 
   Handle<JSFunction> target() const { return hydrogen()->target();  }
   int arity() const { return hydrogen()->argument_count() - 1;  }
 };
 
 
@@ skipping 681 matching lines @@
   void VisitInstruction(HInstruction* current);
 
   void DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block);
   LInstruction* DoBit(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoShift(Token::Value op, HBitwiseBinaryOperation* instr);
   LInstruction* DoArithmeticD(Token::Value op,
                               HArithmeticBinaryOperation* instr);
   LInstruction* DoArithmeticT(Token::Value op,
                               HArithmeticBinaryOperation* instr);
 
+  void DecrementArgumentCount(int amount) {
+    ASSERT(amount <= argument_count_);
+    argument_count_ -= amount;
+  }
+
   LChunk* chunk_;
   HGraph* const graph_;
   Status status_;
   HInstruction* current_instruction_;
   HBasicBlock* current_block_;
   HBasicBlock* next_block_;
   int argument_count_;
   LAllocator* allocator_;
   int position_;
   LInstruction* instructions_pending_deoptimization_environment_;
   int pending_deoptimization_ast_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_LITHIUM_ARM_H_