[release-branch.go1.19] cmd/go: avoid overwriting cached Origin metadata
Fixes #54633.
Updates #54631.
Change-Id: I17d2fa282642aeb1ae2a6e29a0756b8960bea34b
Reviewed-on: https://go-review.googlesource.com/c/go/+/425255
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
(cherry picked from commit
e3004d96b6899945d76e5dd373756324c8ff98fb)
Reviewed-on: https://go-review.googlesource.com/c/go/+/425211