darwin: add support for ThinLTO #2865
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Now that we use the lld linker (see #2586), we can add support for ThinLTO on MacOS. This allows some more optimizations at link time that aren't possible before that point. It also reduces executable sizes a bit, although that's not the main goal (verified using #2864).
The main motivation is that I eventually want to use ThinLTO on all platforms so that we can rely on ThinLTO for certain optimizations.