diff --git a/llvm/lib/Support/CommandLine.cpp b/llvm/lib/Support/CommandLine.cpp
index 1b4d2c7..16db4d6 100644
--- a/llvm/lib/Support/CommandLine.cpp
+++ b/llvm/lib/Support/CommandLine.cpp
@@ -111,6 +111,13 @@
   MarkOptionsChanged();
 }
 
+void Option::removeArgument() {
+  assert(NextRegistered != 0 && "argument never registered");
+  assert(RegisteredOptionList == this && "argument is not the last registered");
+  RegisteredOptionList = NextRegistered;
+  MarkOptionsChanged();
+}
+
 // This collects the different option categories that have been registered.
 typedef SmallPtrSet<OptionCategory*,16> OptionCatSet;
 static ManagedStatic<OptionCatSet> RegisteredOptionCategories;