[strong] Implement strong property access semantics

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index 8ddc494428f9726df604c0c4808e5666b1cf6c28..da0934e9e8c37c07703c66defc9e35214fc706a2 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -81,7 +81,7 @@ static Handle<Object> DebugGetProperty(LookupIterator* it,
           return it->isolate()->factory()->undefined_value();
         }
         MaybeHandle<Object> maybe_result =
-            JSObject::GetPropertyWithAccessor(it);
+            JSObject::GetPropertyWithAccessor(it, SLOPPY);
         Handle<Object> result;
         if (!maybe_result.ToHandle(&result)) {
           result = handle(it->isolate()->pending_exception(), it->isolate());