1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/include/llvm/MC/SubtargetFeature.h b/llvm/include/llvm/MC/SubtargetFeature.h
index 02c9e82ad3a..40d4739fe9c 100644
--- a/llvm/include/llvm/MC/SubtargetFeature.h
+++ b/llvm/include/llvm/MC/SubtargetFeature.h
@@ -59,6 +59,11 @@ struct SubtargetFeatureKV {
   bool operator<(StringRef S) const {
     return StringRef(Key) < S;
   }
+
+  // Compare routine for std::is_sorted.
+  bool operator<(const SubtargetFeatureKV &Other) const {
+    return StringRef(Key) < StringRef(Other.Key);
+  }
 };
 
 //===----------------------------------------------------------------------===//