[turbofan] Introduce LoadFunctionPrototype simplified operator.

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 2367 matching lines @@
         ProcessInput(node, 0, UseInfo::AnyTagged());         // buffer
         ProcessInput(node, 1, UseInfo::AnyTagged());         // base pointer
         ProcessInput(node, 2, UseInfo::PointerInt());        // external pointer
         ProcessInput(node, 3, UseInfo::TruncatingWord32());  // index
         ProcessInput(node, 4,
                      TruncatingUseInfoFromRepresentation(rep));  // value
         ProcessRemainingInputs(node, 5);
         SetOutput(node, MachineRepresentation::kNone);
         return;
       }
+      case IrOpcode::kLoadFunctionPrototype: {
+        if (truncation.IsUnused()) return VisitUnused(node);
+        VisitUnop(node, UseInfo::AnyTagged(),
+                  MachineRepresentation::kTaggedPointer);
+        return;
+      }
       case IrOpcode::kPlainPrimitiveToNumber: {
         if (InputIs(node, Type::Boolean())) {
           VisitUnop(node, UseInfo::Bool(), MachineRepresentation::kWord32);
           if (lower()) DeferReplacement(node, node->InputAt(0));
         } else if (InputIs(node, Type::String())) {
           VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged);
           if (lower()) lowering->DoStringToNumber(node);
         } else if (truncation.IsUsedAsWord32()) {
           if (InputIs(node, Type::NumberOrOddball())) {
             VisitUnop(node, UseInfo::TruncatingWord32(),
@@ skipping 1008 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