xla

9a54abab - [Backport]Add out-of-place all-gather coalesced (#6059) (#6108)

[Backport]Add out-of-place all-gather coalesced (#6059) (#6108) Co-authored-by: jeffhataws <jthuynh@amazon.com> Co-authored-by: Arjun Balasubramanian <arjunbala0711@gmail.com>