[turbofan] Make sure Operator is really immutable.

src/compiler/js-inlining.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/ast-graph-builder.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/graph-visualizer.h"
 #include "src/compiler/js-inlining.h"
@@ skipping 166 matching lines @@
   int inlinee_context_index = inlinee_inputs - 1;
   // {inliner_inputs} counts JSFunction, Receiver, arguments, but not
   // context, effect, control.
   int inliner_inputs = OperatorProperties::GetValueInputCount(call->op());
   // Iterate over all uses of the start node.
   UseIter iter = graph()->start()->uses().begin();
   while (iter != graph()->start()->uses().end()) {
     Node* use = *iter;
     switch (use->opcode()) {
       case IrOpcode::kParameter: {
-        int index = 1 + static_cast<Operator1<int>*>(use->op())->parameter();
+        int index = 1 + OpParameter<int>(use->op());
         if (index < inliner_inputs && index < inlinee_context_index) {
           // There is an input from the call, and the index is a value
           // projection but not the context, so rewire the input.
           NodeProperties::ReplaceWithValue(*iter, call->InputAt(index));
         } else if (index == inlinee_context_index) {
           // This is the context projection, rewire it to the context from the
           // JSFunction object.
           NodeProperties::ReplaceWithValue(*iter, context);
         } else if (index < inlinee_context_index) {
           // Call has fewer arguments than required, fill with undefined.
@@ skipping 89 matching lines @@
 
   Inlinee inlinee(&jsgraph);
   inlinee.UnifyReturn();
   inlinee.InlineAtCall(jsgraph_, node);
 
   jsgraph_->graph()->SetNextNodeId(inlinee.graph()->NextNodeID());
 }
 }
 }
 }  // namespace v8::internal::compiler