LoadUint32() doesn't need a scratch register.

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 20b4a29cd85180b2757e2b9552e9e55560a5c177..5a612b75175d81830c695423864baaaf39232f99 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1997,15 +1997,13 @@ class LInteger32ToDouble V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LUint32ToDouble V8_FINAL : public LTemplateInstruction<1, 1, 1> {
+class LUint32ToDouble V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
-  explicit LUint32ToDouble(LOperand* value, LOperand* temp) {
+  explicit LUint32ToDouble(LOperand* value) {
     inputs_[0] = value;
-    temps_[0] = temp;
   }
 
   LOperand* value() { return inputs_[0]; }
-  LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(Uint32ToDouble, "uint32-to-double")
 };
@@ -2025,17 +2023,15 @@ class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 1> {
 };
 
 
-class LNumberTagU V8_FINAL : public LTemplateInstruction<1, 1, 2> {
+class LNumberTagU V8_FINAL : public LTemplateInstruction<1, 1, 1> {
  public:
-  LNumberTagU(LOperand* value, LOperand* temp1, LOperand* temp2) {
+  LNumberTagU(LOperand* value, LOperand* temp) {
     inputs_[0] = value;
-    temps_[0] = temp1;
-    temps_[1] = temp2;
+    temps_[0] = temp;
   }
 
   LOperand* value() { return inputs_[0]; }
-  LOperand* temp1() { return temps_[0]; }
-  LOperand* temp2() { return temps_[1]; }
+  LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagU, "number-tag-u")
 };