Initialize CodeStubInterfaceDescriptor in the constructor.

src/compiler/linkage.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/linkage.h"
 
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/compiler/node.h"
 #include "src/compiler/pipeline.h"
@@ skipping 34 matching lines @@
     // plus the receiver.
     incoming_ = GetJSCallDescriptor(1 + info->function()->parameter_count());
   } else if (!info->closure().is_null()) {
     // If we are compiling a JS function, use a JS call descriptor,
     // plus the receiver.
     SharedFunctionInfo* shared = info->closure()->shared();
     incoming_ = GetJSCallDescriptor(1 + shared->formal_parameter_count());
   } else if (info->code_stub() != NULL) {
     // Use the code stub interface descriptor.
     HydrogenCodeStub* stub = info->code_stub();
-    CodeStubInterfaceDescriptor descriptor;
-    stub->InitializeInterfaceDescriptor(&descriptor);
+    CodeStubInterfaceDescriptor descriptor(stub);
     incoming_ = GetStubCallDescriptor(&descriptor);
   } else {
     incoming_ = NULL;  // TODO(titzer): ?
   }
 }
 
 
 FrameOffset Linkage::GetFrameOffset(int spill_slot, Frame* frame, int extra) {
   if (frame->GetSpillSlotCount() > 0 || incoming_->IsJSFunctionCall() ||
       incoming_->kind() == CallDescriptor::kCallAddress) {
@@ skipping 90 matching lines @@
 
 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
                                                   MachineSignature* sig) {
   UNIMPLEMENTED();
   return NULL;
 }
 #endif  // !V8_TURBOFAN_BACKEND
 }
 }
 }  // namespace v8::internal::compiler