Subzero: Add -Wshadow to the build.

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.
@@ skipping 12 matching lines @@
 }
 
 namespace Ice {
 
 class Converter : public Translator {
   Converter() = delete;
   Converter(const Converter &) = delete;
   Converter &operator=(const Converter &) = delete;
 
 public:
-  Converter(llvm::Module *Mod, GlobalContext *Ctx)
-      : Translator(Ctx), Mod(Mod) {}
+  Converter(llvm::Module *MyMod, GlobalContext *MyCtx)
+      : Translator(MyCtx), Mod(MyMod) {}
 
   ~Converter() = default;
 
   /// Converts the LLVM Module to ICE. Sets exit status to false if successful,
   /// true otherwise.
   void convertToIce();
 
   llvm::Module *getModule() const { return Mod; }
 
   // Returns the global declaration associated with the corresponding
@@ skipping 21 matching lines @@
   // Converts globals to ICE, and then machine code.
   void convertGlobals(llvm::Module *Mod);
 
   // Installs global declarations into GlobalDeclarationMap.
   void installGlobalDeclarations(llvm::Module *Mod);
 };
 
 } // end of namespace ICE.
 
 #endif // SUBZERO_SRC_ICECONVERTER_H