Introduce {ConstantElementsPair} struct for type safety.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index cf4c5d88755cecf6647185fa2cc307110122da84..839f2a832a490cdf4ed447c0c4e94bf0b798e430 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -1310,6 +1310,13 @@ void ContextExtension::ContextExtensionPrint(std::ostream& os) {  // NOLINT
   os << "\n";
 }
 
+void ConstantElementsPair::ConstantElementsPairPrint(
+    std::ostream& os) {  // NOLINT
+  HeapObject::PrintHeader(os, "ContstantElementsPair");

[mvstanton, 2016/12/16 09:10:18]

Typo here...

[Michael Starzinger, 2016/12/16 09:19:02]

Done.

+  os << "\n - elements_kind: " << static_cast<ElementsKind>(elements_kind());
+  os << "\n - constant_values: " << Brief(constant_values());
+  os << "\n";
+}
 
 void AccessorPair::AccessorPairPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "AccessorPair");