[heap] Modernize all *Page iterators to be proper C++ iterators

src/snapshot/deserializer.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/snapshot/deserializer.h"
 
 #include "src/bootstrapper.h"
 #include "src/external-reference-table.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 13 matching lines @@
     reservations_[current_space].Add({r.chunk_size(), NULL, NULL});
     if (r.is_last()) current_space++;
   }
   DCHECK_EQ(kNumberOfSpaces, current_space);
   for (int i = 0; i < kNumberOfPreallocatedSpaces; i++) current_chunk_[i] = 0;
 }
 
 void Deserializer::FlushICacheForNewIsolate() {
   DCHECK(!deserializing_user_code_);
   // The entire isolate is newly deserialized. Simply flush all code pages.
-  PageIterator it(isolate_->heap()->code_space());
-  while (it.has_next()) {
-    Page* p = it.next();
+  for (Page* p : *isolate_->heap()->code_space()) {
     Assembler::FlushICache(isolate_, p->area_start(),
                            p->area_end() - p->area_start());
   }
 }
 
 void Deserializer::FlushICacheForNewCodeObjects() {
   DCHECK(deserializing_user_code_);
   for (Code* code : new_code_objects_) {
     if (FLAG_serialize_age_code) code->PreAge(isolate_);
     Assembler::FlushICache(isolate_, code->instruction_start(),
@@ skipping 760 matching lines @@
 
       default:
         CHECK(false);
     }
   }
   CHECK_EQ(limit, current);
   return true;
 }
 }  // namespace internal
 }  // namespace v8