Introduce the notion of function addresses in Subzero.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- 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 TargetLoweringX8632 class, which
@@ skipping 469 matching lines @@
   ~TargetX8632() override {}
   template <typename T> void emitConstantPool() const;
 };
 
 class TargetGlobalInitX8632 : public TargetGlobalInitLowering {
 public:
   static TargetGlobalInitLowering *create(GlobalContext *Ctx) {
     return new TargetGlobalInitX8632(Ctx);
   }
 
-  virtual void lower(const GlobalAddress &Addr,
-                     bool DisableTranslation) override;
+  virtual void lower(const GlobalVariable &Vbl, bool DisableTranslation) final;
 
 protected:
   TargetGlobalInitX8632(GlobalContext *Ctx);
 
 private:
   TargetGlobalInitX8632(const TargetGlobalInitX8632 &) = delete;
   TargetGlobalInitX8632 &operator=(const TargetGlobalInitX8632 &) = delete;
   ~TargetGlobalInitX8632() override {}
 };
 
 template <> void ConstantInteger32::emit(GlobalContext *Ctx) const;
 template <> void ConstantInteger64::emit(GlobalContext *Ctx) const;
 template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H