Make closures optimizable by Crankshaft compiler.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 048d4fc80b6adc09a2e14fa68d507baa50127478..39f91987cebeb10a8e0f334ba26bdf940d47ca65 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -87,6 +87,7 @@ class Translation;
 //   LLabel
 //   LLayzBailout
 //   LLoadGlobal
+//   LLoadContextSlot
 //   LMaterializedLiteral
 //     LArrayLiteral
 //     LObjectLiteral
@@ -213,6 +214,7 @@ class Translation;
   V(ClassOfTestAndBranch)                       \
   V(Label)                                      \
   V(LazyBailout)                                \
+  V(LoadContextSlot)                            \
   V(LoadElements)                               \
   V(LoadGlobal)                                 \
   V(LoadKeyedFastElement)                       \
@@ -1266,6 +1268,13 @@ class LStoreGlobal: public LUnaryOperation {
 };
 
 
+class LLoadContextSlot: public LInstruction {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(LoadContextSlot, "load-context-slot")
+  DECLARE_HYDROGEN_ACCESSOR(LoadContextSlot);
+};
+
+
 class LPushArgument: public LUnaryOperation {
  public:
   explicit LPushArgument(LOperand* argument) : LUnaryOperation(argument) {}