ARM: Implement GetCachedArrayIndex in the lithium code generator.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 41f17223ad504c202c70175d56c318fd36076a86..ef055cc8b027739591c8a272800245b785bcbe9b 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -5456,7 +5456,10 @@ void HGraphBuilder::GenerateIsRegExpEquivalent(int argument_count,
 
 void HGraphBuilder::GenerateGetCachedArrayIndex(int argument_count,
                                                 int ast_id) {
-  BAILOUT("inlined runtime function: GetCachedArrayIndex");
+  ASSERT(argument_count == 1);
+  HValue* value = Pop();
+  HGetCachedArrayIndex* result = new HGetCachedArrayIndex(value);
+  ast_context()->ReturnInstruction(result, ast_id);
 }