Use source position table in turbofan code.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 72ca092f5123c0f4920b17bba638594b49612c17..e6788e38f76686b2bdb2f17117d33be50edc691b 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5267,10 +5267,6 @@ class Code: public HeapObject {
   // the layout of the code object into account.
   inline int ExecutableSize();
 
-  // Locating source position.
-  int SourcePosition(int code_offset);
-  int SourceStatementPosition(int code_offset);
-
   DECLARE_CAST(Code)
 
   // Dispatched behavior.
@@ -5497,6 +5493,9 @@ class AbstractCode : public HeapObject {
   // Returns the size of the code instructions.
   inline int instruction_size();
 
+  // Return the source position table.
+  inline ByteArray* source_position_table();
+
   // Returns the size of instructions and the metadata.
   inline int SizeIncludingMetadata();