Reland^2 "Don't compile functions in a context the caller doesn't have access to"

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 6b75ea419814fbbbe2dd70bc0d300862e3bd2fde..aa75fc366c72dd60c396674144669a8959f7f20a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -8939,6 +8939,10 @@ void HandleScopeImplementer::IterateThis(ObjectVisitor* v) {
     Object** start = reinterpret_cast<Object**>(&context_lists[i]->first());
     v->VisitPointers(start, start + context_lists[i]->length());
   }
+  if (microtask_context_) {

[Toon Verwaest, 2016/07/18 12:54:09]

Do we need the null-check here?

[jochen (gone - plz use gerrit), 2016/07/18 12:55:35]

yeah, it's not necessarily set during GC

+    Object** start = reinterpret_cast<Object**>(&microtask_context_);
+    v->VisitPointers(start, start + 1);
+  }
 }