ARM: Implement GetCachedArrayIndex in the lithium code generator.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index a0d932fbd24311f8eeb613edc706e6002cadd60b..9f5170ca2bcc9e5f9d7dcdd9d5fccdbf1f2eb910 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -107,6 +107,7 @@ class LChunkBuilder;
   V(EnterInlined)                              \
   V(FixedArrayLength)                          \
   V(FunctionLiteral)                           \
+  V(GetCachedArrayIndex)                       \
   V(GlobalObject)                              \
   V(GlobalReceiver)                            \
   V(Goto)                                      \
@@ -2331,6 +2332,17 @@ class HHasCachedArrayIndex: public HUnaryPredicate {
 };
 
 
+class HGetCachedArrayIndex: public HUnaryPredicate {
+ public:
+  explicit HGetCachedArrayIndex(HValue* value) : HUnaryPredicate(value) { }
+
+  DECLARE_CONCRETE_INSTRUCTION(GetCachedArrayIndex, "get_cached_array_index")
+
+ protected:
+  virtual bool DataEquals(HValue* other) const { return true; }
+};
+
+
 class HClassOfTest: public HUnaryPredicate {
  public:
   HClassOfTest(HValue* value, Handle<String> class_name)