[strong] create strong array literals

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 00665e3ffdde2dcd3b0b6d16d2d3af4594aaf018..4f664c60c9f695da2e744ec8df7e488fff6f1202 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -225,6 +225,11 @@ template <typename T, class P = FreeStoreAllocationPolicy> class List;
 // -----------------------------------------------------------------------------
 // Declarations for use in both the preparser and the rest of V8.
 
+enum ObjectStrength {
+  WEAK,
+  FIRM  // strong object
+};
+
 // The Strict Mode (ECMA-262 5th edition, 4.2.2).
 
 enum LanguageMode {
@@ -284,6 +289,11 @@ inline LanguageMode construct_language_mode(bool strict_bit, bool strong_bit) {
 }
 
 
+inline ObjectStrength strength(LanguageMode language_mode) {
+  return is_strong(language_mode) ? FIRM : WEAK;
+}
+
+
 // Mask for the sign bit in a smi.
 const intptr_t kSmiSignMask = kIntptrSignBit;