Handle single element array growth + transition in generic KeyedStoreIC

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 102d997fdf93db6151b197a2466025c79229f0a0..1f88c946de964f4155863d51fed6d0b6c287fb61 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -369,6 +369,18 @@ class Context: public FixedArray {
   Object* OptimizedFunctionsListHead();
   void ClearOptimizedFunctions();
 
+  static int GetContextMapIndexFromElementsKind(
+      ElementsKind elements_kind) {
+    if (elements_kind == FAST_DOUBLE_ELEMENTS) {
+      return Context::DOUBLE_JS_ARRAY_MAP_INDEX;
+    } else if (elements_kind == FAST_ELEMENTS) {
+      return Context::OBJECT_JS_ARRAY_MAP_INDEX;
+    } else {
+      ASSERT(elements_kind == FAST_SMI_ONLY_ELEMENTS);
+      return Context::SMI_JS_ARRAY_MAP_INDEX;
+    }
+  }
+
 #define GLOBAL_CONTEXT_FIELD_ACCESSORS(index, type, name) \
   void  set_##name(type* value) {                         \
     ASSERT(IsGlobalContext());                            \