Basic implementation of incremental marking.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index f6f6fc94d140288e4dceaf3b65de2703158b3e2b..a72533bd209de84140d0d66b016754f500a96983 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -38,6 +38,7 @@
 #include "deoptimizer.h"
 #include "execution.h"
 #include "ic-inl.h"
+#include "incremental-marking.h"
 #include "factory.h"
 #include "runtime.h"
 #include "runtime-profiler.h"
@@ -591,6 +592,11 @@ ExternalReference::ExternalReference(const SCTableReference& table_ref)
   : address_(table_ref.address()) {}
 
 
+ExternalReference ExternalReference::incremental_marking_record_write_function() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(IncrementalMarking::RecordWrite)));
+}
+
+
 ExternalReference ExternalReference::perform_gc_function() {
   return ExternalReference(Redirect(FUNCTION_ADDR(Runtime::PerformGC)));
 }