[compiler] Remove CodeStub from CompilationInfo

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/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/linkage.h"
@@ skipping 102 matching lines @@
       more_this = false;
     }
     ++current_input;
     ++other_input;
   }
   return HasSameReturnLocationsAs(OpParameter<CallDescriptor const*>(node));
 }
 
 
 CallDescriptor* Linkage::ComputeIncoming(Zone* zone, CompilationInfo* info) {
-  if (info->code_stub() != nullptr) {
-    // Use the code stub interface descriptor.
-    CodeStub* stub = info->code_stub();
-    CallInterfaceDescriptor descriptor = stub->GetCallInterfaceDescriptor();
-    return GetStubCallDescriptor(
-        info->isolate(), zone, descriptor, stub->GetStackParameterCount(),
-        CallDescriptor::kNoFlags, Operator::kNoProperties);
-  }
+  DCHECK(!info->IsStub());
   if (info->has_literal()) {
     // If we already have the function literal, use the number of parameters
     // plus the receiver.
     return GetJSCallDescriptor(zone, info->is_osr(),
                                1 + info->literal()->parameter_count(),
                                CallDescriptor::kNoFlags);
   }
   if (!info->closure().is_null()) {
     // If we are compiling a JS function, use a JS call descriptor,
     // plus the receiver.
@@ skipping 389 matching lines @@
   } else {
     DCHECK(loc == regloc(kContextRegister));
     return LinkageLocation::ForCalleeFrameSlot(Frame::kContextSlot);
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8