Fix uint32-to-smi conversion in Lithium

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 6c036c7b5dd3204b1250736e4c5e770c699053d4..ed07229e17c54c294472200ed0b81c854c940290 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -184,6 +184,7 @@ class LCodeGen;
   V(Typeof)                                     \
   V(TypeofIsAndBranch)                          \
   V(Uint32ToDouble)                             \
+  V(Uint32ToSmi)                                \
   V(UnknownOSRValue)                            \
   V(ValueOf)                                    \
   V(WrapReceiver)
@@ -2074,6 +2075,19 @@ class LUint32ToDouble V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 };
 
 
+class LUint32ToSmi V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LUint32ToSmi(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(Uint32ToSmi, "uint32-to-smi")
+  DECLARE_HYDROGEN_ACCESSOR(Change)
+};
+
+
 class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LNumberTagI(LOperand* value) {