Support slots recording for compaction during incremental marking.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index a8efdd938d2f862dad9e290dfb1314839d9d920a..416ef0407616285da9f9cda4303fcc425375af35 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -561,6 +561,8 @@ class ExternalReference BASE_EMBEDDED {
 
   static ExternalReference incremental_marking_record_write_function(
       Isolate* isolate);
+  static ExternalReference incremental_evacuation_record_write_function(
+      Isolate* isolate);
   static ExternalReference store_buffer_overflow_function(
       Isolate* isolate);
   static ExternalReference perform_gc_function(Isolate* isolate);