Use source position table for crankshaft code.

src/crankshaft/ia32/lithium-codegen-ia32.h

Index: src/crankshaft/ia32/lithium-codegen-ia32.h
diff --git a/src/crankshaft/ia32/lithium-codegen-ia32.h b/src/crankshaft/ia32/lithium-codegen-ia32.h
index 5084819dced5da952c0c14800fa4e247c5edcf32..7c812bad68086c69f5b494324b217f45adeb8b94 100644
--- a/src/crankshaft/ia32/lithium-codegen-ia32.h
+++ b/src/crankshaft/ia32/lithium-codegen-ia32.h
@@ -239,7 +239,7 @@ class LCodeGen: public LCodeGenBase {
 
   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,
@@ -250,8 +250,6 @@ class LCodeGen: public LCodeGenBase {
                                     int arguments,
                                     Safepoint::DeoptMode mode);
 
-  void RecordAndWritePosition(int position) override;
-
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);