Simplify logic now that r182490 is in place.  No functional change intended.

llvm-svn: 182531
diff --git a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
index 0eb74a4..d4955b3 100644
--- a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -201,8 +201,8 @@
 
     if (MO.isUse() && Special) {
       if (!KeepRegs.test(Reg)) {
-        KeepRegs.set(Reg);
-        for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
+        for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
+             SubRegs.isValid(); ++SubRegs)
           KeepRegs.set(*SubRegs);
       }
     }