Index: lib/CodeGen/MachineFunction.cpp
===================================================================
--- lib/CodeGen/MachineFunction.cpp
+++ lib/CodeGen/MachineFunction.cpp
@@ -621,9 +621,9 @@
 
   // Saved CSRs are not pristine.
   const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo();
-  for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
-         E = CSI.end(); I != E; ++I)
-    BV.reset(I->getReg());
+  for (auto &I : getCalleeSavedInfo())
+    for (MCSubRegIterator S(I.getReg(), TRI, true); S.isValid(); ++S)
+      BV.reset(*S);
 
   return BV;
 }