Subzero: Add -Wshadow to the build.

src/IceInstX8632.h

Index: src/IceInstX8632.h
diff --git a/src/IceInstX8632.h b/src/IceInstX8632.h
index 51868b47122399cb47f32a78074434e0ac9166b5..a99bdf138bd8b67da41b1140317893330d0ce39f 100644
--- a/src/IceInstX8632.h
+++ b/src/IceInstX8632.h
@@ -132,8 +132,8 @@ public:
   }
 
 private:
-  VariableSplit(Cfg *Func, Variable *Var, Portion Part)
-      : OperandX8632(kSplit, IceType_i32), Var(Var), Part(Part) {
+  VariableSplit(Cfg *Func, Variable *MyVar, Portion MyPart)
+      : OperandX8632(kSplit, IceType_i32), Var(MyVar), Part(MyPart) {
     assert(Var->getType() == IceType_f64);
     Vars = Func->allocateArrayOf<Variable *>(1);
     Vars[0] = Var;
@@ -1175,8 +1175,8 @@ protected:
   bool Locked;
 
   InstX8632Lockable(Cfg *Func, InstKindX8632 Kind, SizeT Maxsrcs,
-                    Variable *Dest, bool Locked)
-      : InstX8632(Func, Kind, Maxsrcs, Dest), Locked(Locked) {
+                    Variable *Dest, bool MyLocked)
+      : InstX8632(Func, Kind, Maxsrcs, Dest), Locked(MyLocked) {
     // Assume that such instructions are used for Atomics and be careful
     // with optimizations.
     HasSideEffects = Locked;