[strong] Implement strong mode restrictions on property access

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 5baa151488f1e03cdf16026751ac31c09cd86b6d..1c808a79886b19677a57e72fd7ed291578027049 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());