efriedma added a comment. If you're specifically concerned about sibcall (call->jmp) optimization in the backend, it might be better to adjust the backend to avoid sibcalls at -O1, as opposed to messing with optimization passes. (i.e. make -fno-optimize-sibling-calls the default at -O1.) "tail" markings are useful for other purposes, like alias analysis, and I don't really want every optimization pass/frontend that might add "tail" markings to worry about the optimization level.
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