Remove a brittle assertion from Turbofan lazy deoptimization handling.

src/compiler/arm/code-generator-arm.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/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 814 matching lines @@
     UNREACHABLE();
   }
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() {
   // On 32-bit ARM we do not insert nops for inlined Smi code.
   UNREACHABLE();
 }
 
-#ifdef DEBUG
-
-// Checks whether the code between start_pc and end_pc is a no-op.
-bool CodeGenerator::IsNopForSmiCodeInlining(Handle<Code> code, int start_pc,
-                                            int end_pc) {
-  return false;
-}
-
-#endif  // DEBUG
-
 #undef __
 }
 }
 }  // namespace v8::internal::compiler