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SCC profiling was enabled in a convoluted way: if WayProf was enabled, Opt_SccProfilingOn general flag was set (in `GHC.Driver.Ways.wayGeneralFlags`), and then this flag was queried in various places. There is no need to go via general flags, so this patch defines a `sccProfilingEnabled :: DynFlags -> Bool` helper function that just checks whether WayProf is enabled.
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