[SystemZ] Rename PSW to CC

Addresses a review comment from Ulrich Weigand.  No functional change intended.

I'm not sure whether the old TODO that this patch touches still holds,
but that's something we'd get to when adding a targetted scheduling
description.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182474 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/SystemZ/SystemZFrameLowering.cpp

@@ -283,7 +283,7 @@ static void emitIncrement(MachineBasicBlock &MBB,
     }
     MachineInstr *MI = BuildMI(MBB, MBBI, DL, TII->get(Opcode), Reg)
       .addReg(Reg).addImm(ThisVal);
-    // The PSW implicit def is dead.
+    // The CC implicit def is dead.
     MI->getOperand(3).setIsDead();
     NumBytes -= ThisVal;
   }