[dev.link] cmd/link: drop hash maps after loading

The hash maps are used to deduplicate hashed symbols. Once we
loaded all the symbols, we no longer need the hash maps. Drop
them.

Linking cmd/compile,

name         old live-B     new live-B     delta
Loadlib_GC      13.1M ± 0%     11.3M ± 0%   -13.62%  (p=0.008 n=5+5)

Change-Id: I4bb1f84e1111a56d9e777cd6a68f7d974b60e321
Reviewed-on: https://go-review.googlesource.com/c/go/+/245721
Reviewed-by: Jeremy Faller <jeremy@golang.org>
2 files changed
tree: 205c38c7b7265ef61027f71d9202ecef2ed10964
  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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