Subzero: Add -Wshadow to the build.

src/IceELFSection.cpp

Index: src/IceELFSection.cpp
diff --git a/src/IceELFSection.cpp b/src/IceELFSection.cpp
index 7893354b55e4b96c1ac02fd533d526446bd75cd2..100d072cdab277eeb02e2c15158324e9a9b1a6ae 100644
--- a/src/IceELFSection.cpp
+++ b/src/IceELFSection.cpp
@@ -16,7 +16,12 @@
 
 #include "IceDefs.h"
 #include "IceELFStreamer.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wshadow"
 #include "llvm/Support/MathExtras.h"
+#pragma clang diagnostic pop
 
 using namespace llvm::ELF;