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 3419a6ea0323e99a26ae882eb6e9a6130cdb4b1d..4f56394ef31e988f773b2408b747e5588cfcc8fb 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2514,15 +2514,15 @@ 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_;
     }
   }
@@ -2605,7 +2605,7 @@ 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;