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9d476e1e1a
Currently, the UnifiedLTO pipeline seems to have trouble with several LTO features, like SplitLTO units, which means we cannot use important optimizations like Whole Program Devirtualization or security hardening instrumentation like CFI. This patch reverts FatLTO to using distinct pipelines for Full LTO and ThinLTO. It still avoids module cloning, since that was error prone.