[turbofan] Introduce CallDescriptorOf helper for safety.

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/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 615 matching lines @@
 
     // Convert inputs to the output representation of this phi, pass the
     // truncation truncation along.
     UseInfo input_use(output, truncation);
     for (int i = 0; i < node->InputCount(); i++) {
       ProcessInput(node, i, i < values ? input_use : UseInfo::None());
     }
   }
 
   void VisitCall(Node* node, SimplifiedLowering* lowering) {
-    const CallDescriptor* desc = OpParameter<const CallDescriptor*>(node->op());
+    const CallDescriptor* desc = CallDescriptorOf(node->op());
     const MachineSignature* sig = desc->GetMachineSignature();
     int params = static_cast<int>(sig->parameter_count());
     // Propagate representation information from call descriptor.
     for (int i = 0; i < node->InputCount(); i++) {
       if (i == 0) {
         // The target of the call.
         ProcessInput(node, i, UseInfo::None());
       } else if ((i - 1) < params) {
         ProcessInput(node, i, TruncatingUseInfoFromRepresentation(
                                   sig->GetParam(i - 1).representation()));
@@ skipping 1532 matching lines @@
   if (!rhs_type->Is(type_cache_.kZeroToThirtyOne)) {
     node->ReplaceInput(1, graph()->NewNode(machine()->Word32And(), rhs,
                                            jsgraph()->Int32Constant(0x1f)));
   }
   NodeProperties::ChangeOp(node, op);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8