Subzero: Add -Wshadow to the build.

src/IceELFStreamer.h

 //===- subzero/src/IceELFStreamer.h - Low level ELF writing -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 10 matching lines @@
 namespace Ice {
 
 /// Low level writer that can that can handle ELFCLASS32/64.
 /// Little endian only for now.
 class ELFStreamer {
   ELFStreamer() = delete;
   ELFStreamer(const ELFStreamer &) = delete;
   ELFStreamer &operator=(const ELFStreamer &) = delete;
 
 public:
-  explicit ELFStreamer(Fdstream &Out) : Out(Out) {}
+  explicit ELFStreamer(Fdstream &MyOut) : Out(MyOut) {}
 
   void write8(uint8_t Value) { Out << char(Value); }
 
   void writeLE16(uint16_t Value) {
     write8(uint8_t(Value));
     write8(uint8_t(Value >> 8));
   }
 
   void writeLE32(uint32_t Value) {
     writeLE16(uint16_t(Value));
@@ skipping 38 matching lines @@
 
   void seek(uint64_t Off) { Out.seek(Off); }
 
 private:
   Fdstream &Out;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEELFSTREAMER_H