Use source position table for crankshaft code.

src/crankshaft/arm/lithium-codegen-arm.h

 // Copyright 2012 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_CRANKSHAFT_ARM_LITHIUM_CODEGEN_ARM_H_
 #define V8_CRANKSHAFT_ARM_LITHIUM_CODEGEN_ARM_H_
 
 #include "src/ast/scopes.h"
 #include "src/crankshaft/arm/lithium-arm.h"
 #include "src/crankshaft/arm/lithium-gap-resolver-arm.h"
@@ skipping 235 matching lines @@
 
   Register ToRegister(int index) const;
   DwVfpRegister ToDoubleRegister(int index) const;
 
   MemOperand BuildSeqStringOperand(Register string,
                                    LOperand* index,
                                    String::Encoding encoding);
 
   void EmitIntegerMathAbs(LMathAbs* instr);
 
-  // Support for recording safepoint and position information.
+  // Support for recording safepoint information.
   void RecordSafepoint(LPointerMap* pointers,
                        Safepoint::Kind kind,
                        int arguments,
                        Safepoint::DeoptMode mode);
   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
   void RecordSafepoint(Safepoint::DeoptMode mode);
   void RecordSafepointWithRegisters(LPointerMap* pointers,
                                     int arguments,
                                     Safepoint::DeoptMode mode);
 
-  void RecordAndWritePosition(int position) override;
-
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
 
   // EmitBranch expects to be the last instruction of a block.
   template<class InstrType>
   void EmitBranch(InstrType instr, Condition condition);
   template <class InstrType>
   void EmitTrueBranch(InstrType instr, Condition condition);
   template <class InstrType>
   void EmitFalseBranch(InstrType instr, Condition condition);
@@ skipping 105 matching lines @@
   Label entry_;
   Label exit_;
   Label* external_exit_;
   int instruction_index_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_ARM_LITHIUM_CODEGEN_ARM_H_