Don't add code dependencies eagerly for HCheckMaps.

src/lithium.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 "lithium.h"
 #include "scopes.h"
 
 #if V8_TARGET_ARCH_IA32
 #include "ia32/lithium-ia32.h"
@@ skipping 216 matching lines @@
 }
 
 
 LChunk::LChunk(CompilationInfo* info, HGraph* graph)
     : spill_slot_count_(0),
       info_(info),
       graph_(graph),
       instructions_(32, graph->zone()),
       pointer_maps_(8, graph->zone()),
       inlined_closures_(1, graph->zone()),
-      deprecation_dependencies_(MapLess(), MapAllocator(graph->zone())) {
+      deprecation_dependencies_(MapLess(), MapAllocator(graph->zone())),
+      stability_dependencies_(MapLess(), MapAllocator(graph->zone())) {
 }
 
 
 LLabel* LChunk::GetLabel(int block_id) const {
   HBasicBlock* block = graph_->blocks()->at(block_id);
   int first_instruction = block->first_instruction_index();
   return LLabel::cast(instructions_[first_instruction]);
 }
 
 
@@ skipping 127 matching lines @@
 
 void LChunk::CommitDependencies(Handle<Code> code) const {
   for (MapSet::const_iterator it = deprecation_dependencies_.begin(),
        iend = deprecation_dependencies_.end(); it != iend; ++it) {
     Handle<Map> map = *it;
     ASSERT(!map->is_deprecated());
     ASSERT(map->CanBeDeprecated());
     Map::AddDependentCode(map, DependentCode::kTransitionGroup, code);
   }
 
+  for (MapSet::const_iterator it = stability_dependencies_.begin(),
+       iend = stability_dependencies_.end(); it != iend; ++it) {
+    Handle<Map> map = *it;
+    ASSERT(map->is_stable());
+    ASSERT(map->CanTransition());
+    Map::AddDependentCode(map, DependentCode::kPrototypeCheckGroup, code);
+  }
+
   info_->CommitDependencies(code);
 }
 
 
 LChunk* LChunk::NewChunk(HGraph* graph) {
   DisallowHandleAllocation no_handles;
   DisallowHeapAllocation no_gc;
   graph->DisallowAddingNewValues();
   int values = graph->GetMaximumValueID();
   CompilationInfo* info = graph->info();
@@ skipping 207 matching lines @@
 
 
 LPhase::~LPhase() {
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceLithium(name(), chunk_);
   }
 }
 
 
 } }  // namespace v8::internal