Refactor MathPowHalf on ia32.

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 51706472258beb38902e4aebcc72664540a5af35..7e126ff03c4c24ee56fc561cef9a3e3c2fc60d8e 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -123,6 +123,7 @@ class LCodeGen;
   V(LoadNamedField)                             \
   V(LoadNamedFieldPolymorphic)                  \
   V(LoadNamedGeneric)                           \
+  V(MathPowHalf)                                \
   V(ModI)                                       \
   V(MulI)                                       \
   V(NumberTagD)                                 \
@@ -582,6 +583,24 @@ class LUnaryMathOperation: public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LMathPowHalf: public LTemplateInstruction<1, 2, 1> {
+ public:
+  LMathPowHalf(LOperand* context, LOperand* value, LOperand* temp) {
+    inputs_[1] = context;
+    inputs_[0] = value;
+    temps_[0] = temp;
+  }
+
+  LOperand* context() { return inputs_[1]; }
+  LOperand* value() { return inputs_[0]; }
+  LOperand* temp() { return temps_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(MathPowHalf, "math-pow-half")
+
+  virtual void PrintDataTo(StringStream* stream);
+};
+
+
 class LCmpObjectEqAndBranch: public LControlInstruction<2, 0> {
  public:
   LCmpObjectEqAndBranch(LOperand* left, LOperand* right) {