[dev.link] cmd/link: drop fields of external symbols after LoadFull

Free some memory.

Linking cmd/compile with external linking,

name             old live-B     new live-B     delta
Loadlibfull_GC     55.3M ± 0%     52.2M ± 0%    -5.50%  (p=0.008 n=5+5)

Change-Id: Ib8de2e61f2b012efaf6bdd98f9e5c56a19910b47
Reviewed-on: https://go-review.googlesource.com/c/go/+/231224
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
1 file changed
tree: 7b548efe7a9861ece412b0190867b2be2026bfcb
  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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