Index: include/llvm/Option/ArgList.h
===================================================================
--- include/llvm/Option/ArgList.h
+++ include/llvm/Option/ArgList.h
@@ -306,6 +306,8 @@
   const char *GetOrMakeJoinedArgString(unsigned Index, StringRef LHS,
                                         StringRef RHS) const;
 
+  void dump() const;
+
   /// @}
 };
 
Index: lib/Option/ArgList.cpp
===================================================================
--- lib/Option/ArgList.cpp
+++ lib/Option/ArgList.cpp
@@ -328,6 +328,13 @@
   return MakeArgString(LHS + RHS);
 }
 
+LLVM_DUMP_METHOD void ArgList::dump() const {
+  for (Arg *A : *this) {
+    llvm::errs() << "* ";
+    A->dump();
+  }
+}
+
 //
 
 void InputArgList::releaseMemory() {