Revert "Simplify code.  NFC."

This reverts commit r248610.

llvm-svn: 249887
diff --git a/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp b/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
index a3a52aa..845408f 100644
--- a/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
+++ b/llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
@@ -224,7 +224,12 @@
   if (Reg == 0)
     return false;
 
-  MachineOperand *Op = MI->findRegisterUseOperand(Reg, /*isKill=*/MO.isDef());
+  MachineOperand *Op = nullptr;
+  if (MO.isDef())
+    Op = MI->findRegisterUseOperand(Reg, true);
+  else
+    Op = MI->findRegisterDefOperand(Reg);
+
   return(Op && Op->isImplicit());
 }