Revert "Remove BinaryOp::result_type"

src/hydrogen.cc

 // 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 8879 matching lines @@
 }
 
 
 HInstruction* HOptimizedGraphBuilder::BuildBinaryOperation(
     BinaryOperation* expr,
     HValue* left,
     HValue* right) {
   HValue* context = environment()->LookupContext();
   Handle<Type> left_type = expr->left()->lower_type();
   Handle<Type> right_type = expr->right()->lower_type();
-  Handle<Type> result_type = expr->lower_type();
+  Handle<Type> result_type = expr->result_type();
   Maybe<int> fixed_right_arg = expr->fixed_right_arg();
   Representation left_rep = ToRepresentation(left_type);
   Representation right_rep = ToRepresentation(right_type);
   Representation result_rep = ToRepresentation(result_type);
   if (left_type->Is(Type::None())) {
     AddSoftDeoptimize();
     // TODO(rossberg): we should be able to get rid of non-continuous defaults.
     left_type = handle(Type::Any(), isolate());
   }
   if (right_type->Is(Type::None())) {
@@ skipping 2109 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal