Use source position table for unoptimized code.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 6fff393f68fbef605a28f32a6998f97dfc54ce96..f3bb493f89d4bba35589fff19c8890bf50f1e4ac 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -6426,6 +6426,7 @@ INT_ACCESSORS(Code, constant_pool_offset, kConstantPoolOffset)
 ACCESSORS(Code, relocation_info, ByteArray, kRelocationInfoOffset)
 ACCESSORS(Code, handler_table, FixedArray, kHandlerTableOffset)
 ACCESSORS(Code, deoptimization_data, FixedArray, kDeoptimizationDataOffset)
+ACCESSORS(Code, source_position_table, ByteArray, kSourcePositionTableOffset)
 ACCESSORS(Code, raw_type_feedback_info, Object, kTypeFeedbackInfoOffset)
 ACCESSORS(Code, next_code_link, Object, kNextCodeLinkOffset)
 
@@ -6434,6 +6435,7 @@ void Code::WipeOutHeader() {
   WRITE_FIELD(this, kRelocationInfoOffset, NULL);
   WRITE_FIELD(this, kHandlerTableOffset, NULL);
   WRITE_FIELD(this, kDeoptimizationDataOffset, NULL);
+  WRITE_FIELD(this, kSourcePositionTableOffset, NULL);
   // Do not wipe out major/minor keys on a code stub or IC
   if (!READ_FIELD(this, kTypeFeedbackInfoOffset)->IsSmi()) {
     WRITE_FIELD(this, kTypeFeedbackInfoOffset, NULL);
@@ -6493,6 +6495,7 @@ int Code::SizeIncludingMetadata() {
   size += relocation_info()->Size();
   size += deoptimization_data()->Size();
   size += handler_table()->Size();
+  if (kind() == FUNCTION) size += source_position_table()->Size();
   return size;
 }