Subzero: Add -Wshadow to the build.

src/IceTargetLowering.cpp

Index: src/IceTargetLowering.cpp
diff --git a/src/IceTargetLowering.cpp b/src/IceTargetLowering.cpp
index 671bab029d0d30871a55e94f9a27052f27f36a9d..9bac6dc509aa49bdb96fb8e016a2b67bd7c965b5 100644
--- a/src/IceTargetLowering.cpp
+++ b/src/IceTargetLowering.cpp
@@ -80,8 +80,8 @@ TargetLowering *TargetLowering::createLowering(TargetArch Target, Cfg *Func) {
   return nullptr;
 }
 
-TargetLowering::TargetLowering(Cfg *Func)
-    : Func(Func), Ctx(Func->getContext()), Context() {}
+TargetLowering::TargetLowering(Cfg *MyFunc)
+    : Func(MyFunc), Ctx(Func->getContext()), Context() {}
 
 std::unique_ptr<Assembler> TargetLowering::createAssembler(TargetArch Target,
                                                            Cfg *Func) {
@@ -110,7 +110,7 @@ void TargetLowering::doNopInsertion() {
                     I->isDeleted();
   if (!ShouldSkip) {
     int Probability = Ctx->getFlags().getNopProbabilityAsPercentage();
-    for (int I = 0; I < Ctx->getFlags().getMaxNopsPerInstruction(); ++I) {
+    for (int i = 0; i < Ctx->getFlags().getMaxNopsPerInstruction(); ++i) {
       randomlyInsertNop(Probability / 100.0);
     }
   }