Disable speculative LICM when it may lead to unnecessary deopts

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 317 matching lines @@
   }
 
   ZoneList<HUnknownOSRValue*>* osr_values() {
     return osr_values_.get();
   }
 
   void set_osr_values(ZoneList<HUnknownOSRValue*>* values) {
     osr_values_.set(values);
   }
 
+  int update_type_change_checksum(int delta) {
+    type_change_checksum_ += delta;
+    return type_change_checksum_;
+  }
+
+  bool use_optimistic_licm() {
+    return use_optimistic_licm_;
+  }
+
+  void set_use_optimistic_licm(bool value) {
+    use_optimistic_licm_ = value;
+  }
+
   void MarkRecursive() {
     is_recursive_ = true;
   }
 
   bool is_recursive() const {
     return is_recursive_;
   }
 
  private:
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
@@ skipping 30 matching lines @@
   SetOncePointer<HConstant> constant_hole_;
   SetOncePointer<HArgumentsObject> arguments_object_;
 
   SetOncePointer<HBasicBlock> osr_loop_entry_;
   SetOncePointer<ZoneList<HUnknownOSRValue*> > osr_values_;
 
   CompilationInfo* info_;
   Zone* zone_;
 
   bool is_recursive_;
+  bool use_optimistic_licm_;
+  int type_change_checksum_;
 
   DISALLOW_COPY_AND_ASSIGN(HGraph);
 };
 
 
 Zone* HBasicBlock::zone() const { return graph_->zone(); }
 
 
 // Type of stack frame an environment might refer to.
 enum FrameType {
@@ skipping 1059 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_