[objects.h splitting] Move out ConstantElementsPair and BoileplateDescriptor.

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 0c0e535329b3b7d306b86e7a9e70cb63cf39b10c..63823d05d524cf26d313a8043f034ba6ba24a39a 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -16,6 +16,7 @@
 #include "src/contexts.h"
 #include "src/conversions.h"
 #include "src/elements.h"
+#include "src/objects/literal-objects.h"
 #include "src/property-details.h"
 #include "src/property.h"
 #include "src/string-stream.h"
@@ -671,6 +672,10 @@ bool ObjectLiteral::IsFastCloningSupported() const {
                                    kMaximumClonedShallowObjectProperties;
 }
 
+ElementsKind ArrayLiteral::constant_elements_kind() const {
+  return static_cast<ElementsKind>(constant_elements()->elements_kind());
+}
+
 void ArrayLiteral::InitDepthAndFlags() {
   DCHECK_LT(first_spread_index_, 0);