[dev.link] cmd/link: experiment new reloc accessors in deadcode pass

There is a small speedup:

(linking cmd/compile)

name       old time/op    new time/op    delta
Deadcode     57.1ms ± 1%    53.5ms ± 1%   -6.44%  (p=0.008 n=5+5)

With this, we don't need a slice to read the relocations, reduce
some allocations.

name       old alloc/op   new alloc/op   delta
Deadcode     4.16MB ± 0%    3.84MB ± 0%   -7.85%  (p=0.008 n=5+5)

Change-Id: Icd41c05682ba3f293a8cb9d2fe818e39d7276e5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/222244
Reviewed-by: Than McIntosh <thanm@google.com>
4 files changed
tree: f538d9caabf93bfdcf2d829a877c5b2d7dc718e0
  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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