Use ld.gold by default to link in CI (#57061)
Summary:
This adds an option to CMake to use `ld.gold` to link rather than `ld` (which symlinks to `ld.bfd` on Ubuntu by default). This shouldn't change any functionality, only a mild improvement on link times during builds (shaves off 1 minute) on CI.
Verify by searching for `ld.gold is available` in [the logs](https://circleci.com/api/v1.1/project/github/pytorch/pytorch/13046834/output/105/0?file=true&allocation-id=608c434338107e5b6cf938a1-0-build%2F7BDA2FF1)
](https://our.intern.facebook.com/intern/diff/28123522/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57061
Pulled By: driazati
Reviewed By: janeyx99
Differential Revision: D28123522
fbshipit-source-id: 5a60798ca4785427fd92bbf3b3aa5f63730e9b20
Author
davidriazati@fb.com
