Get CallInterfaceDescriptor directly from CodeStub.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 0b302bcb40fde2c7672941b6f71dde7e4e8310a3..74af3980ff7215adc96a40bb47efae53b7d5804d 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -852,9 +852,9 @@ void SimplifiedLowering::DoStoreElement(Node* node) {
 
 void SimplifiedLowering::DoStringAdd(Node* node) {
   StringAddStub stub(zone()->isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
-  CodeStubInterfaceDescriptor d(&stub);
+  CallInterfaceDescriptor d = stub.GetCallInterfaceDescriptor();
   CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
-  CallDescriptor* desc = Linkage::GetStubCallDescriptor(&d, 0, flags, zone());
+  CallDescriptor* desc = Linkage::GetStubCallDescriptor(d, 0, flags, zone());
   node->set_op(common()->Call(desc));
   node->InsertInput(zone(), 0, jsgraph()->HeapConstant(stub.GetCode()));
   node->AppendInput(zone(), jsgraph()->UndefinedConstant());