... when receiver is in dictionary mode.

Bug: v8:6490
Change-Id: Ic5a8d214adcc4efd4cb163cbc6b351c4e6b596af
Reviewed-on: https://chromium-review.googlesource.com/559548Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46428}