GetIdentityHashHelper function can return hash from GlobalDictionary,
but SetHashAndUpdateProperties crashes on DCHECK on attempt to set
this hash (it works when DCHECKs are disabled because SetHash is defined
on base class for NameDictionary and GlobalDictionary).

R=yangguo@chromium.org

Bug: none
Change-Id: I740fa6a3232f7db8e4396b9a5e4664b8ab81969a
Reviewed-on: https://chromium-review.googlesource.com/1198765Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55551}