AllocateUninitializedJSArrayWithElements into the method.

Prior to the change, if the caller forgets to handle empty case on
their side, AllocateUninitializedJSArrayWithElements would allocate a
new empty FixedArray rather than return the canonical one. This refactor
shifts the burden of canonicalization from the callers to
AllocateUninitializedJSArrayWithElements.


Bug: v8:6777
Change-Id: I1246cb288861b65b51938414a454f21af78f8399
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1480330Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Irina Yatsenko <irinayat@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60015}