Move control flow optimization to CmmCPS.
Unfortunately, I couldn't remove all incidences of runCmmContFlowOpt from HscMain; in particular, there is a Cmm conversion testing facility which may run with only control flow optimizations, which I preserved the semantics of. Given the state of the current codegen, this code might be moribund anyway. Signed-off-by: Edward Z. Yang <email@example.com>
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