[turbofan] Fix loop exit rename for return/throw.

src/compiler/control-builders.cc

Index: src/compiler/control-builders.cc
diff --git a/src/compiler/control-builders.cc b/src/compiler/control-builders.cc
index d6b8b4050b84f5aad493cbc55a357dbfd4c5a3af..b159bb2da797abc761419c8bc4d73124789e7754 100644
--- a/src/compiler/control-builders.cc
+++ b/src/compiler/control-builders.cc
@@ -91,7 +91,7 @@ void LoopBuilder::ExitLoop(Node** extra_value_to_rename) {
   environment()->PrepareForLoopExit(loop_environment_->GetControlDependency(),
                                     assigned_);
   if (extra_value_to_rename) {
-    environment()->Pop();
+    *extra_value_to_rename = environment()->Pop();
   }
 }