Make closures optimizable by Crankshaft compiler.

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 3f48e50e22d765c3f6a26d2f82ec798dd7752a1a..78bb5f89d96b610f647eafbeaf17e38f29730048 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -88,6 +88,7 @@ class LGapNode;
 //   LGlobalReceiver
 //   LLabel
 //   LLayzBailout
+//   LLoadContextSlot
 //   LLoadGlobal
 //   LMaterializedLiteral
 //     LArrayLiteral
@@ -220,6 +221,7 @@ class LGapNode;
   V(ClassOfTestAndBranch)                       \
   V(Label)                                      \
   V(LazyBailout)                                \
+  V(LoadContextSlot)                            \
   V(LoadElements)                               \
   V(LoadGlobal)                                 \
   V(LoadKeyedFastElement)                       \
@@ -1327,6 +1329,15 @@ class LStoreGlobal: public LUnaryOperation {
 };
 
 
+class LLoadContextSlot: public LInstruction {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(LoadContextSlot, "load-context-slot")
+  DECLARE_HYDROGEN_ACCESSOR(LoadContextSlot)
+
+  virtual void PrintDataTo(StringStream* stream) const;
+};
+
+
 class LPushArgument: public LUnaryOperation {
  public:
   explicit LPushArgument(LOperand* argument) : LUnaryOperation(argument) {}