Global Objects now use the Smi handler StoreSlow() to perform
StoreGlobalIC_Slow.

Bug: chromium:1004037
Change-Id: I365ab918383525278590ca4369a4b1b0d9636d29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1812657Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Suraj Sharma <surshar@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#63912}