Use source position table for crankshaft code.

src/crankshaft/mips64/lithium-codegen-mips64.h

Index: src/crankshaft/mips64/lithium-codegen-mips64.h
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.h b/src/crankshaft/mips64/lithium-codegen-mips64.h
index 9ac3192e3a058d06868b4cad61f971017a1a681a..0273b7f886c1fd0d6de82bb58348ae80c91df111 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.h
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.h
@@ -254,7 +254,7 @@ class LCodeGen: public LCodeGenBase {
   void EmitIntegerMathAbs(LMathAbs* instr);
   void EmitSmiMathAbs(LMathAbs* instr);
 
-  // Support for recording safepoint and position information.
+  // Support for recording safepoint information.
   void RecordSafepoint(LPointerMap* pointers,
                        Safepoint::Kind kind,
                        int arguments,
@@ -265,8 +265,6 @@ 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);