diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -1429,7 +1429,7 @@
 void TargetPassConfig::addOptimizedRegAlloc() {
   addPass(&DetectDeadLanesID);
 
-  addPass(&ProcessImplicitDefsID, false);
+  addPass(&ProcessImplicitDefsID);
 
   // LiveVariables currently requires pure SSA form.
   //