Subzero: Add -Wshadow to the build.

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declarations ------*- 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 various useful types and classes that have widespread use
 // across Subzero.  Every Subzero source file is expected to include IceDefs.h.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEDEFS_H
 #define SUBZERO_SRC_ICEDEFS_H
 
 #include "IceBuildDefs.h" // TODO(stichnot): move into individual files
 #include "IceTLS.h"
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wshadow"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/ilist.h"
 #include "llvm/ADT/ilist_node.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/ADT/SmallBitVector.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/raw_ostream.h"
+#pragma clang diagnostic pop
 
 #include <cassert>
 #include <cstdint>
 #include <cstdio>     // snprintf
 #include <functional> // std::less
 #include <limits>
 #include <list>
 #include <map>
 #include <memory>
 #include <mutex>
@@ skipping 222 matching lines @@
 llvm::iterator_range<typename T::reverse_iterator> reverse_range(T &Container) {
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 
 // Options for pooling and randomization of immediates
 enum RandomizeAndPoolImmediatesEnum { RPI_None, RPI_Randomize, RPI_Pool };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H