[dev.link] cmd/internal/goobj2, cmd/link: experiment another way of accessing relocations

Use a different mechanism to access relocations from the object
files, and use it in the stack bounds check pass. This shows some
speedup.

(linking cmd/compile)
Dostkcheck     76.9ms ± 1%    55.1ms ± 1%  -28.36%  (p=0.008 n=5+5)

Change-Id: I2ac42da515dccd64719fb557ffff6cdc69e4319b
Reviewed-on: https://go-review.googlesource.com/c/go/+/222240
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
4 files changed
tree: 9e4b413b0ba3d8b81ace0333fcda4b525ace9f47
  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
README.md

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