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2021-03-10Remove the -Zinsert-sideeffectSimonas Kazlauskas-0/+29
This removes all of the code we had in place to work-around LLVM's handling of forward progress. From this removal excluded is a workaround where we'd insert a `sideeffect` into clearly infinite loops such as `loop {}`. This code remains conditionally effective when the LLVM version is earlier than 12.0, which fixed the forward progress related miscompilations at their root.