Call RecordWriteIntoCode in RelocInfo::set_target_cell.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
diff --git a/src/x64/assembler-x64-inl.h b/src/x64/assembler-x64-inl.h
index bfec51c462f7ec008ecf1ced1845c9ccded456df..af4ed9718bab2c49faf1c4033eac34eb3f1d62fa 100644
--- a/src/x64/assembler-x64-inl.h
+++ b/src/x64/assembler-x64-inl.h
@@ -456,10 +456,8 @@ void RelocInfo::set_target_cell(Cell* cell,
   }
   if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
       host() != NULL) {
-    // TODO(1550) We are passing NULL as a slot because cell can never be on
-    // evacuation candidate.
-    host()->GetHeap()->incremental_marking()->RecordWrite(
-        host(), NULL, cell);
+    host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(host(), this,
+                                                                  cell);
   }
 }