cmd/go: support replaces in the go.work file

Add support for replace directives in the go.work file. If there are
conflicting replaces in go.mod files, suggest that users add an
overriding replace in the go.work file.

Add HighestReplaced to MainModules so that it accounts for the
replacements in the go.work file.

(Reviewers: I'm not totally sure that HighestReplace is computed
correctly. Could you take a closer look at that?)

For #45713

Change-Id: I1d789219ca1dd065ba009ce5d38db9a1fc38ba83
Reviewed-on: https://go-review.googlesource.com/c/go/+/352812
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
13 files changed
tree: a8e30032e10627478de2baefc04d3457e581efce
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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