[WIP] JSForInLowering and JSForInHasOwnProperty.

src/compiler/simplified-lowering.cc

 // Copyright 2014 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 "src/compiler/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/address-map.h"
 #include "src/base/bits.h"
@@ skipping 2380 matching lines @@
         }
         return;
       }
 
       case IrOpcode::kAllocate: {
         ProcessInput(node, 0, UseInfo::TruncatingWord32());
         ProcessRemainingInputs(node, 1);
         SetOutput(node, MachineRepresentation::kTaggedPointer);
         return;
       }
+      case IrOpcode::kLoadFieldByIndex: {
+        if (truncation.IsUnused()) return VisitUnused(node);
+        VisitBinop(node, UseInfo::AnyTagged(), UseInfo::TruncatingWord32(),
+                   MachineRepresentation::kTagged);
+        return;
+      }
       case IrOpcode::kLoadField: {
         if (truncation.IsUnused()) return VisitUnused(node);
         FieldAccess access = FieldAccessOf(node->op());
         MachineRepresentation const representation =
             access.machine_type.representation();
         VisitUnop(node, UseInfoForBasePointer(access), representation);
         return;
       }
       case IrOpcode::kStoreField: {
         FieldAccess access = FieldAccessOf(node->op());
@@ skipping 1200 matching lines @@
         isolate(), graph()->zone(), callable.descriptor(), 0, flags,
         Operator::kNoProperties);
     to_number_operator_.set(common()->Call(desc));
   }
   return to_number_operator_.get();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8