Update DoNumberTagI to support x32 port.

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
diff --git a/src/x64/lithium-codegen-x64.h b/src/x64/lithium-codegen-x64.h
index 686dc857aa5ecf694c466cb7ba4ec029cf2dd205..12d9b3266abbc19a18d8fa89d6d6293fd8b5bff9 100644
--- a/src/x64/lithium-codegen-x64.h
+++ b/src/x64/lithium-codegen-x64.h
@@ -83,7 +83,14 @@ class LCodeGen: public LCodeGenBase {
 
   // Deferred code support.
   void DoDeferredNumberTagD(LNumberTagD* instr);
-  void DoDeferredNumberTagU(LNumberTagU* instr);
+
+  enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
+  void DoDeferredNumberTagIU(LInstruction* instr,
+                             LOperand* value,
+                             LOperand* temp1,
+                             LOperand* temp2,
+                             IntegerSignedness signedness);
+
   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
   void DoDeferredStackCheck(LStackCheck* instr);