[dev.link] cmd/oldlink: add back the old linker

Basically a "cp -r" from tip's cmd/link (at commit
776a9d0958973bff6a66e61baa6a9a240ada4255), and fix up import
paths.

It is not used for now. A flag will be introduced in followup
CLs, which will allow to switch between the old and new linker.

Some adjustments to make it still build:
- Adjust accessor of NoSplit attribute to match the change in
  goobj2 package (cmd/oldlink/internal/loader/loader.go:1206).
- Change sym.Symbol's Len method to Length to match the new
  interface in cmd/internal/dwarf
  (cmd/oldlink/internal/sym/symbol.go:102).
- Add a TODO for deletion (cmd/oldlink/main.go:5).

Change-Id: I76e62f259cb6b494280f5511f75913bc37874746
Reviewed-on: https://go-review.googlesource.com/c/go/+/224622
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
96 files changed
tree: 6a247cdb523a5bb50314fb1e384ebb50bd1b051f
  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
  18. SECURITY.md
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