Added a Isolate* parameter to Serializer::enabled().

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 775db592f21ad741a0c89938e5808b6ea2d04f03..8cecfd1a49df50addd7ed0f473480a20d650e9e3 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2507,15 +2507,15 @@ class NoTrackDoubleFieldsForSerializerScope {
  public:
   explicit NoTrackDoubleFieldsForSerializerScope(Isolate* isolate)
       : isolate_(isolate), flag_(FLAG_track_double_fields) {
-    if (Serializer::enabled()) {
+    if (Serializer::enabled(isolate)) {
       // Disable tracking double fields because heap numbers treated as
       // immutable by the serializer.
       FLAG_track_double_fields = false;
     }
-    USE(isolate_);
   }
+
   ~NoTrackDoubleFieldsForSerializerScope() {
-    if (Serializer::enabled()) {
+    if (Serializer::enabled(isolate_)) {
       FLAG_track_double_fields = flag_;
     }
   }
@@ -2598,7 +2598,7 @@ Genesis::Genesis(Isolate* isolate,
   // We can't (de-)serialize typed arrays currently, but we are lucky: The state
   // of the random number generator needs no initialization during snapshot
   // creation time and we don't need trigonometric functions then.
-  if (!Serializer::enabled()) {
+  if (!Serializer::enabled(isolate)) {
     // Initially seed the per-context random number generator using the
     // per-isolate random number generator.
     const int num_elems = 2;