cmd/go: pass package config to vet during "go vet"

After this CL, "go vet" can be guaranteed to have complete type information
about the packages being checked, even if cgo or swig is in use,
which will in turn make it reasonable for vet checks to insist on type
information. It also fixes vet's understanding of unusual import paths
like relative paths and vendored packages.

For now "go tool vet" will continue to cope without type information,
but the eventual plan is for "go tool vet" to query the go command for
what it needs, and also to be able to query alternate build systems
like bazel. But that's future work.

Fixes #4889.
Fixes #12556 (if not already fixed).
Fixes #15182.
Fixes #16086.
Fixes #17571.

Change-Id: I932626ee7da649b302cd269b82eb6fe5d7b9f0f2
Reviewed-on: https://go-review.googlesource.com/74750
Reviewed-by: Ian Lance Taylor <iant@golang.org>
7 files changed
tree: f9d57abd3771f385a7977b380e5e1f28d3469f22
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
README.md

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