[GHC] Batch modify: #14684, #14727, #14765, #14806, #14816, #14823, ...

[GHC]

Batch modification to #14684, #14727, #14765, #14806, #14816, #14823, #14838, #14839, #14870, #14909, #14911, #14973, #15007, #15010, #15011 by bgamari:
milestone to 8.8.1

Comment:
These won't be addressed in GHC 8.6.

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