Push safepoint registers in deferred number-to-i/u only on-demand.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index fa5e88b033308bb991f59295d285cc1ae2a49e92..c5e253befbefb66779989a625a0acc8f453bf4f6 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -148,9 +148,11 @@ class LCodeGen: public LCodeGenBase {
   void DoDeferredNumberTagD(LNumberTagD* instr);
 
   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
-  void DoDeferredNumberTagI(LInstruction* instr,
-                            LOperand* value,
-                            IntegerSignedness signedness);
+  void DoDeferredNumberTagIU(LInstruction* instr,
+                             LOperand* value,
+                             LOperand* temp1,
+                             LOperand* temp2,
+                             IntegerSignedness signedness);
 
   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);