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..9186f6d39cfa552158728aa8823ca37d183849fc 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -150,6 +150,8 @@ class LCodeGen: public LCodeGenBase {
   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
   void DoDeferredNumberTagI(LInstruction* instr,
                             LOperand* value,
+                            LOperand* temp1,
+                            LOperand* temp2,
                             IntegerSignedness signedness);
 
   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);