Subzero: Fix a memory leak.

src/IceTranslator.h

 //===- subzero/src/IceTranslator.h - ICE to machine code --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 23 matching lines @@
 /// other intermediate representations down to ICE, and then call the
 /// appropriate (inherited) methods to convert ICE into machine instructions.
 class Translator {
   Translator() = delete;
   Translator(const Translator &) = delete;
   Translator &operator=(const Translator &) = delete;
 
 public:
   explicit Translator(GlobalContext *Ctx);
 
-  ~Translator();
+  virtual ~Translator() = default;
   const ErrorCode &getErrorStatus() const { return ErrorStatus; }
 
   GlobalContext *getContext() const { return Ctx; }
 
   const ClFlags &getFlags() const { return Ctx->getFlags(); }
 
   /// Translates the constructed ICE function Fcn to machine code.
   /// Takes ownership of Func.
   void translateFcn(std::unique_ptr<Cfg> Func);
 
@@ skipping 16 matching lines @@
 protected:
   GlobalContext *Ctx;
   uint32_t NextSequenceNumber;
   /// ErrorCode of the translation.
   ErrorCode ErrorStatus;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETRANSLATOR_H