[release-branch.go1.25] cmd/go: always return the cached path from go tool -n

If we're running go tool -n always return the cached path of the tool.
We can't always use the cached path when running the tool because if we
copied the tool to the cached location in the same process and then try
to run it we'll run into #22315, producing spurious ETXTBSYs.

Fixes #72824

Change-Id: I81f23773b9028f955ccc97453627ae4f2573814b
Reviewed-on: https://go-review.googlesource.com/c/go/+/688895
Auto-Submit: Michael Matloob <matloob@golang.org>
Reviewed-by: Michael Matloob <matloob@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit efc37e97c0f358f3cffe7ca2b78c743470345189)
Reviewed-on: https://go-review.googlesource.com/c/go/+/690895
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
4 files changed
tree: 03250741d65b941f7035a5cf87d08def3ed3bf41
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
  17. VERSION
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