Merged r18697 into 3.22 branch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 1703ddedd5331d879e1edc7c82a138b6b3e9d5f6..da5cdeced4c6a90f1c4075e1f1fdbf41737a2265 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1472,6 +1472,8 @@ class HReturn V8_FINAL : public HTemplateControlInstruction<0, 3> {
   DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HReturn, HValue*);
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
+    // TODO(titzer): require an Int32 input for faster returns.
+    if (index == 2) return Representation::Smi();
     return Representation::Tagged();
   }