Use source position table for crankshaft code.

src/crankshaft/x87/lithium-codegen-x87.h

Index: src/crankshaft/x87/lithium-codegen-x87.h
diff --git a/src/crankshaft/x87/lithium-codegen-x87.h b/src/crankshaft/x87/lithium-codegen-x87.h
index f979cf0d35012cb55e9f4d1f50a05111c1f20f55..49845f2f3b076f980da18b48a4df0928858ec38e 100644
--- a/src/crankshaft/x87/lithium-codegen-x87.h
+++ b/src/crankshaft/x87/lithium-codegen-x87.h
@@ -267,7 +267,7 @@ 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,
@@ -278,8 +278,6 @@ 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);