Subzero: Add -Wshadow to the build.

unittest/IceParseInstsTest.cpp

 //===- unittest/IceParseInstsTest.cpp - test instruction errors -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include <string>
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wshadow"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Bitcode/NaCl/NaClBitcodeParser.h"
 #include "llvm/Bitcode/NaCl/NaClLLVMBitCodes.h"
 #pragma clang diagnostic pop
 
 #include "BitcodeMunge.h"
 #include "unittests/Bitcode/NaClMungeTest.h"
 
 using namespace llvm;
 using namespace naclmungetest;
@@ skipping 371 matching lines @@
   EXPECT_EQ("Error(62:4): Invalid function record: <24 2 1 31>\n",
             Munger.getTestResults());
   EXPECT_FALSE(DumpMunger.runTestForAssembly(ARRAY(Align30)));
   EXPECT_EQ(
       "    store float %p1, float* %p0, align 0;\n"
       "Error(62:4): store: Illegal alignment for float. Expects: 1 or 4\n",
       DumpMunger.getLinesWithSubstring("store"));
 }
 
 } // end of anonymous namespace