Merged r18697 into 3.23 branch.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index d4beb6e1de2180b9fb903116a2d66b4dc7f21428..045ef932e1ebf94b1c0020a1feeddbf0c6805285 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1585,6 +1585,8 @@ 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();
   }