The UpdateSharedWasmMemoryObjects function only creates a new
JSArrayBuffer when the the legths of old/new ArrayBuffer objects
are unequal, but the CHECK in the Grow() funciton assumes that a new
object is always created. Fix so that a new ArrayBuffer is always
allocated.

Bug: v8:10044, chromium:1040325
Change-Id: I66912bdc091e65a57e5b50f4ed63b0da5492dcc4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1999603Reviewed-by: Ben Smith <binji@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65742}