[Git][ghc/ghc][master] Introduce parenBreakableList and use it in ppHsContext

<p class="src" ><a id="v:y" class="def" >y :: (a <=> a, Op a a <=> a) => a :: (a <=> a, Op a a <=> a) => a <a href="#" class="selflink" >#</a ></p >

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