Subzero: Add -Wshadow to the build.

unittest/IceELFSectionTest.cpp

 //===- unittest/IceELFSectionTest.cpp - ELF Section unit tests ------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include <algorithm>
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wshadow"
 #include "gtest/gtest.h"
+#pragma clang diagnostic pop
 
 #include "IceDefs.h"
 #include "IceELFSection.h"
 
 namespace Ice {
 namespace {
 
 // Test string table layout for various permutations. Test that pop,
 // lollipop, and lipop are able to share data, while the other strings do not.
 void CheckStringTablePermLayout(const ELFStringTableSection &Strtab) {
@@ skipping 105 matching lines @@
   Strtab.add("lollipop");
   Strtab.add("pop");
   Strtab.add("unpop");
 
   Strtab.doLayout();
   CheckStringTablePermLayout(Strtab);
 }
 
 } // end of anonymous namespace
 } // end of namespace Ice