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

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index 5251b85fa91e212e7832ab5b96821adedad09f6a..a6488815bed799d5620c5fe8f6ae4b2ac343704f 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -128,6 +128,8 @@ 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);