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

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 073bcdd6d3b0309955da6b8257de36986b913fff..caf4a18f30d663b0ecd2e841bed3d97bc0bb6416 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1937,27 +1937,31 @@ class LUint32ToSmi V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 1> {
  public:
-  explicit LNumberTagI(LOperand* value) {
+  LNumberTagI(LOperand* value, LOperand* temp) {
     inputs_[0] = value;
+    temps_[0] = temp;
   }
 
   LOperand* value() { return inputs_[0]; }
+  LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagI, "number-tag-i")
 };
 
 
-class LNumberTagU V8_FINAL : public LTemplateInstruction<1, 1, 1> {
+class LNumberTagU V8_FINAL : public LTemplateInstruction<1, 1, 2> {
  public:
-  LNumberTagU(LOperand* value, LOperand* temp) {
+  LNumberTagU(LOperand* value, LOperand* temp1, LOperand* temp2) {
     inputs_[0] = value;
-    temps_[0] = temp;
+    temps_[0] = temp1;
+    temps_[1] = temp2;
   }
 
   LOperand* value() { return inputs_[0]; }
-  LOperand* temp() { return temps_[0]; }
+  LOperand* temp1() { return temps_[0]; }
+  LOperand* temp2() { return temps_[1]; }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagU, "number-tag-u")
 };