Subzero: Add -Wshadow to the build.

src/IceRNG.h

Index: src/IceRNG.h
diff --git a/src/IceRNG.h b/src/IceRNG.h
index 5ddd97f247fedfa551f01bf78cbb4b27e9635244..63c0acd1a8c7c1bdb7f0203f533400f24b29090e 100644
--- a/src/IceRNG.h
+++ b/src/IceRNG.h
@@ -15,8 +15,13 @@
 #ifndef SUBZERO_SRC_ICERNG_H
 #define SUBZERO_SRC_ICERNG_H
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#pragma clang diagnostic ignored "-Wshadow"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Compiler.h"
+#pragma clang diagnostic pop
+
 #include <cstdint>
 
 namespace Ice {
@@ -46,8 +51,8 @@ class RandomNumberGeneratorWrapper {
 public:
   uint64_t operator()(uint64_t Max) { return RNG.next(Max); }
   bool getTrueWithProbability(float Probability);
-  explicit RandomNumberGeneratorWrapper(RandomNumberGenerator &RNG)
-      : RNG(RNG) {}
+  explicit RandomNumberGeneratorWrapper(RandomNumberGenerator &MyRNG)
+      : RNG(MyRNG) {}
 
 private:
   RandomNumberGenerator &RNG;