Remove assumption from the heap verifier that objects occupy a narrow range of the address space.

runtime/vm/heap.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 148 matching lines @@
 
   // Return amount of memory used and capacity in a space, excluding external.
   int64_t UsedInWords(Space space) const;
   int64_t CapacityInWords(Space space) const;
   int64_t ExternalInWords(Space space) const;
   // Return the amount of GCing in microseconds.
   int64_t GCTimeInMicros(Space space) const;
 
   intptr_t Collections(Space space) const;
 
-  ObjectSet* CreateAllocatedObjectSet(MarkExpectation mark_expectation) const;
+  ObjectSet* CreateAllocatedObjectSet(Zone* zone,
+                                      MarkExpectation mark_expectation) const;
 
   static const char* GCReasonToString(GCReason gc_reason);
 
   // Associate a peer with an object.  A non-existent peer is equal to NULL.
   void SetPeer(RawObject* raw_obj, void* peer) {
     SetWeakEntry(raw_obj, kPeers, reinterpret_cast<intptr_t>(peer));
   }
   void* GetPeer(RawObject* raw_obj) const {
     return reinterpret_cast<void*>(GetWeakEntry(raw_obj, kPeers));
   }
@@ skipping 142 matching lines @@
   void PrintStats();
   void UpdateClassHeapStatsBeforeGC(Heap::Space space);
   void PrintStatsToTimeline(TimelineEventScope* event);
 
   // Updates gc in progress flags.
   bool BeginNewSpaceGC(Thread* thread);
   void EndNewSpaceGC();
   bool BeginOldSpaceGC(Thread* thread);
   void EndOldSpaceGC();
 
-  // If this heap is non-empty, updates start and end to the smallest range that
-  // contains both the original [start, end) and the [lowest, highest) addresses
-  // of this heap.
-  void GetMergedAddressRange(uword* start, uword* end) const;
+  void AddRegionsToObjectSet(ObjectSet* set) const;
 
   Isolate* isolate_;
 
   // The different spaces used for allocation.
   ALIGN8 Scavenger new_space_;
   PageSpace old_space_;
 
   WeakTable* new_weak_tables_[kNumWeakSelectors];
   WeakTable* old_weak_tables_[kNumWeakSelectors];
 
@@ skipping 46 matching lines @@
 // Note: During this scope, the code pages are non-executable.
 class WritableVMIsolateScope : StackResource {
  public:
   explicit WritableVMIsolateScope(Thread* thread);
   ~WritableVMIsolateScope();
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_