Move atomic ops and related files to base library

src/elements-kind.cc

Index: src/elements-kind.cc
diff --git a/src/elements-kind.cc b/src/elements-kind.cc
index 240f551caae3a737569e19a396e263887aae7c5d..845286decce583259c654a50fd18f684e437831f 100644
--- a/src/elements-kind.cc
+++ b/src/elements-kind.cc
@@ -5,6 +5,7 @@
 #include "src/elements-kind.h"
 
 #include "src/api.h"
+#include "src/base/lazy-instance.h"
 #include "src/elements.h"
 #include "src/objects.h"
 
@@ -102,8 +103,8 @@ struct InitializeFastElementsKindSequence {
 };
 
 
-static LazyInstance<ElementsKind*,
-                    InitializeFastElementsKindSequence>::type
+static base::LazyInstance<ElementsKind*,
+                          InitializeFastElementsKindSequence>::type
     fast_elements_kind_sequence = LAZY_INSTANCE_INITIALIZER;