Initialize CodeStubInterfaceDescriptor in the constructor.

src/x64/lithium-x64.cc

 // Copyright 2012 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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/hydrogen-osr.h"
 #include "src/lithium-inl.h"
@@ skipping 2463 matching lines @@
 }
 
 
 LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
   LParameter* result = new(zone()) LParameter;
   if (instr->kind() == HParameter::STACK_PARAMETER) {
     int spill_index = chunk()->GetParameterStackSlot(instr->index());
     return DefineAsSpilled(result, spill_index);
   } else {
     DCHECK(info()->IsStub());
-    CodeStubInterfaceDescriptor descriptor;
-    info()->code_stub()->InitializeInterfaceDescriptor(&descriptor);
+    CodeStubInterfaceDescriptor descriptor(info()->code_stub());
     int index = static_cast<int>(instr->index());
     Register reg = descriptor.GetEnvironmentParameterRegister(index);
     return DefineFixed(result, reg);
   }
 }
 
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
   // Use an index that corresponds to the location in the unoptimized frame,
   // which the optimized frame will subsume.
@@ skipping 181 matching lines @@
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, rsi), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64