Use stability to only conditionally flush information from the map check table.

src/hydrogen-instructions.cc

 // Copyright 2012 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 "v8.h"
 
 #include "double.h"
 #include "factory.h"
 #include "hydrogen-infer-representation.h"
 #include "property-details-inl.h"
@@ skipping 3931 matching lines @@
 
 void HAllocate::CreateFreeSpaceFiller(int32_t free_space_size) {
   ASSERT(filler_free_space_size_ == NULL);
   Zone* zone = block()->zone();
   HInstruction* free_space_instr =
       HInnerAllocatedObject::New(zone, context(), dominating_allocate_,
       dominating_allocate_->size(), type());
   free_space_instr->InsertBefore(this);
   HConstant* filler_map = HConstant::CreateAndInsertAfter(
       zone, Unique<Map>::CreateImmovable(
-          isolate()->factory()->free_space_map()), free_space_instr);
+          isolate()->factory()->free_space_map()), true, free_space_instr);
   HInstruction* store_map = HStoreNamedField::New(zone, context(),
       free_space_instr, HObjectAccess::ForMap(), filler_map);
   store_map->SetFlag(HValue::kHasNoObservableSideEffects);
   store_map->InsertAfter(filler_map);
 
   // We must explicitly force Smi representation here because on x64 we
   // would otherwise automatically choose int32, but the actual store
   // requires a Smi-tagged value.
   HConstant* filler_size = HConstant::CreateAndInsertAfter(
       zone, context(), free_space_size, Representation::Smi(), store_map);
@@ skipping 813 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal