Introduce model of global initializers in Subzero.

src/IceConverter.h

 //===- subzero/src/IceConverter.h - Converts LLVM to ICE --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the LLVM to ICE converter.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECONVERTER_H
 #define SUBZERO_SRC_ICECONVERTER_H
 
 #include "IceTranslator.h"
 
 namespace llvm {
 class Module;
 }
 
 namespace Ice {
 
 class Converter : public Translator {
 public:
   Converter(llvm::Module *Mod, GlobalContext *Ctx, const Ice::ClFlags &Flags)
       : Translator(Ctx, Flags), Mod(Mod) {}
+
   /// Converts the LLVM Module to ICE. Sets exit status to false if successful,
   /// true otherwise.
   void convertToIce();
 
 private:
   llvm::Module *Mod;
   // Converts functions to ICE, and then machine code.
   void convertFunctions();
+
+  // Converts globals to ICE, and then machine code.
+  void convertGlobals(llvm::Module *Mod);
+
   Converter(const Converter &) = delete;
   Converter &operator=(const Converter &) = delete;
 };
-}
+
+} // end of namespace ICE.
 
 #endif // SUBZERO_SRC_ICECONVERTER_H