Support for -z unique-symbols

[jpoimboe]

When the upstream kgaslr patches get merged, we'll have to support -z unique symbols. A duplicate symbol will get renamed during linking. We'll have to detect that somehow and manage it accordingly.

[github-actions]

This issue has been open for 30 days with no activity and no assignee. It will be closed in 7 days unless a comment is added.

[github-actions]

This issue was closed because it was inactive for 7 days after being marked stale.