Version 5.0.71.39 (cherry-pick)

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8eb8b71b39347918cf32ef3c7127e410a3340bd4..8116f14d30260af9d630e8841d3c1e738bab5a5f 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -2512,6 +2512,7 @@ bool Isolate::IsFastArrayConstructorPrototypeChainIntact() {
 }
 
 bool Isolate::IsArraySpeciesLookupChainIntact() {
+  if (!FLAG_harmony_species) return true;
   // Note: It would be nice to have debug checks to make sure that the
   // species protector is accurate, but this would be hard to do for most of
   // what the protector stands for:
@@ -2530,6 +2531,7 @@ bool Isolate::IsArraySpeciesLookupChainIntact() {
 }
 
 void Isolate::InvalidateArraySpeciesProtector() {
+  if (!FLAG_harmony_species) return;
   DCHECK(factory()->species_protector()->value()->IsSmi());
   DCHECK(IsArraySpeciesLookupChainIntact());
   PropertyCell::SetValueWithInvalidation(