Support "phase control" for SPECIALISE pragmas
This featurelet allows Trac #5237 to be fixed. The idea is to allow SPECIALISE pragmas to specify the phases in which the RULE is active, just as you can do with RULES themselves. {-# SPECIALISE [1] foo :: Int -> Int #-} This feature is so obvious that not having it is really a bug. There are, needless to say, a few wrinkles. See Note [Activation pragmas for SPECIALISE] in DsBinds
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