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Auto merge of rust-lang#105845 - lqd:revert-thinlto-revert, r=Mark-Simulacrum
Re-enable ThinLTO for rustc on `x86_64-apple-darwin`
ThinLTO was disabled on x64 mac in rust-lang#105646 because of the rust-lang#105637 regression.
It was later discovered that the issue was present on other targets as well, as the mac revert was already landing. The linux/win reverts, however, did not land before the root cause was identified.
rust-lang#105800 fixed the underlying issue in `-Zdylib-lto` handling, and the x64 msvc and linux targets are now fixed, ICEs are using the correct `rustc_driver` panic hook.
This PR re-enables ThinLTO on mac for improved perf now that the issue should be fixed everywhere.
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