all: use path for go.mod module path

We have various small submodules in the repository, mostly used for code
generation tools with external dependencies.

Currently naming is fairly ad-hoc. Some name the module based on the
path of the directory, while others use a single name like _gen.

If a developer creates a go.work file creating a workspace containing
these submodules (go work use -r .) [1], then all module names must be
unique.

Since CL 772102, we have two modules named _gen, so any operation after
creating go.work immediately fails with a duplicate module error.

Resolve this by using module paths based on the path to the directory.
The load bearing changes here are modifying
cmd/compile/internal/ssa/_gen/go.mod and/or simd/archsimd/_gen/go.mod so
they no longer conflict, but I've changed all module paths to use the
same naming scheme for consistency.

Note that std and cmd get special treatment by cmd/go, so avoid those
prefixes. e.g., the cmd/vet modules seem to ignore the Go language
version when using a cmd/ prefix.

[1] I found this issue because the build process for cross-references on
https://cs.opensource.google/go does this and is currently broken.

Change-Id: I8b3a351c16bd6d52192fb7b45186c38f6a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/798560
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
23 files changed
tree: e7c7d3cd0e3ae222c191a64e56ff2655be3fff4f
  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
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