Clean up exit status and globals procecessing in llvm2ice.

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(GlobalContext *Ctx, Ice::ClFlags &Flags) : Translator(Ctx, Flags) {}
-  /// Converts the LLVM Module to ICE. Returns exit status 0 if successful,
-  /// Nonzero otherwise.
-  int convertToIce(llvm::Module *Mod);
+  /// Converts the LLVM Module to ICE. Sets exit status to false if successful,
+  /// true otherwise.
+  void convertToIce(llvm::Module *Mod);
 
 private:
+  // Converts globals to ICE, and then machine code.
+  void convertGlobals(llvm::Module *Mod);
+  // Converts functions to ICE, and then machine code.
+  void convertFunctions(llvm::Module *Mod);
   Converter(const Converter &) LLVM_DELETED_FUNCTION;
   Converter &operator=(const Converter &) LLVM_DELETED_FUNCTION;
 };
 }
 
 #endif // SUBZERO_SRC_ICECONVERTER_H