Support slots recording for compaction during incremental marking.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 16ed9ecfdd6276d6bcf98527046b0cdad3e41127..a8457e5fa826fa4a6ba0cff5b0a13aed1b7ad7f2 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -746,6 +746,14 @@ ExternalReference ExternalReference::
 
 
 ExternalReference ExternalReference::
+    incremental_evacuation_record_write_function(Isolate* isolate) {
+  return ExternalReference(Redirect(
+      isolate,
+      FUNCTION_ADDR(IncrementalMarking::RecordWriteForEvacuationFromCode)));
+}
+
+
+ExternalReference ExternalReference::
     store_buffer_overflow_function(Isolate* isolate) {
   return ExternalReference(Redirect(
       isolate,