Use compilation info isolate pointer in lithium codegen.

src/ia32/lithium-codegen-ia32.h

 // Copyright 2011 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 50 matching lines @@
         deferred_(8),
         osr_pc_offset_(-1),
         deoptimization_reloc_size(),
         resolver_(this) {
     PopulateDeoptimizationLiteralsWithInlinedFunctions();
   }
 
   // Simple accessors.
   MacroAssembler* masm() const { return masm_; }
   CompilationInfo* info() const { return info_; }
+  Isolate* isolate() const { return info_->isolate(); }
+  Factory* factory() const { return isolate()->factory(); }
+  Heap* heap() const { return isolate()->heap(); }
 
   // Support for converting LOperands to assembler types.
   Operand ToOperand(LOperand* op) const;
   Register ToRegister(LOperand* op) const;
   XMMRegister ToDoubleRegister(LOperand* op) const;
   Immediate ToImmediate(LOperand* op);
 
   // The operand denoting the second word (the one with a higher address) of
   // a double stack slot.
   Operand HighOperand(LOperand* op);
@@ skipping 221 matching lines @@
  private:
   LCodeGen* codegen_;
   Label entry_;
   Label exit_;
   Label* external_exit_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_LITHIUM_CODEGEN_IA32_H_