[release-branch.go1.17] encoding/xml: use iterative Skip, rather than recursive
Prevents exhausting the stack limit in _incredibly_ deeply nested
structures.
Fixes #53711
Updates #53614
Fixes CVE-2022-28131
Change-Id: I47db4595ce10cecc29fbd06afce7b299868599e6
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/
1419912
Reviewed-by: Julie Qiu <julieqiu@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
(cherry picked from commit
9278cb78443d2b4deb24cbb5b61c9ba5ac688d49)
Reviewed-on: https://go-review.googlesource.com/c/go/+/417068
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>