Reverted r375425 as it broke some buildbots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375444 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveDebugValues.cpp

@@ -1439,7 +1439,8 @@ bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) {
   TRI = MF.getSubtarget().getRegisterInfo();
   TII = MF.getSubtarget().getInstrInfo();
   TFI = MF.getSubtarget().getFrameLowering();
-  TFI->getCalleeSaves(MF, CalleeSavedRegs);
+  TFI->determineCalleeSaves(MF, CalleeSavedRegs,
+                            std::make_unique<RegScavenger>().get());
   LS.initialize(MF);
 
   bool Changed = ExtendRanges(MF);