Subzero: Add -Wshadow to the build.

src/IceTargetLoweringX8632Traits.h

 //===- subzero/src/IceTargetLoweringX8632Traits.h - x86-32 traits -*- C++ -*-=//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 609 matching lines @@
     Address toAsmAddress(const Cfg *Func) const;
     void emit(const Cfg *Func) const override;
     using X86Operand::dump;
     void dump(const Cfg *Func, Ostream &Str) const override;
 
     static bool classof(const Operand *Operand) {
       return Operand->getKind() == static_cast<OperandKind>(kSplit);
     }
 
   private:
-    VariableSplit(Cfg *Func, Variable *Var, Portion Part)
-        : X86Operand(kSplit, IceType_i32), Var(Var), Part(Part) {
+    VariableSplit(Cfg *Func, Variable *MyVar, Portion MyPart)
+        : X86Operand(kSplit, IceType_i32), Var(MyVar), Part(MyPart) {
       assert(Var->getType() == IceType_f64);
       Vars = Func->allocateArrayOf<Variable *>(1);
       Vars[0] = Var;
       NumVars = 1;
     }
 
     Variable *Var;
     Portion Part;
   };
 
@@ skipping 53 matching lines @@
 
 } // end of namespace X86Internal
 
 namespace X8632 {
 using Traits = ::Ice::X86Internal::MachineTraits<TargetX8632>;
 } // end of namespace X8632
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632TRAITS_H