[GHC] Batch modify: #15219, #15220, #15221, #15231, #15233, #15234, ...

[GHC]

Batch modification to #15219, #15220, #15221, #15231, #15233, #15234, #15235, #15239, #15245, #15246, #15247, #15248, #15249, #15250, #15251, #15252, #15257, #15258, #15261, #15262, #15263, #15270, #15271 by bgamari:
milestone to 8.8.1

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

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