Crankshaft support for IN.

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 4add6bf43cbc3690bf07b5959f0357f0dd278b27..fbabb4be171c73212a1d303c880bed8cca805190 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -102,6 +102,7 @@ class LCodeGen;
   V(HasCachedArrayIndexAndBranch)               \
   V(HasInstanceType)                            \
   V(HasInstanceTypeAndBranch)                   \
+  V(In)                                         \
   V(InstanceOf)                                 \
   V(InstanceOfAndBranch)                        \
   V(InstanceOfKnownGlobal)                      \
@@ -1992,6 +1993,20 @@ class LStackCheck: public LTemplateInstruction<0, 0, 0> {
 };
 
 
+class LIn: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LIn(LOperand* key, LOperand* object) {
+    inputs_[0] = key;
+    inputs_[1] = object;
+  }
+
+  LOperand* key() { return inputs_[0]; }
+  LOperand* object() { return inputs_[1]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(In, "in")
+};
+
+
 class LChunkBuilder;
 class LChunk: public ZoneObject {
  public: