[GHC] Batch modify: #2595, #9701, #11310, #345, #1158, #7494, #7503, ...

[GHC]

Batch modification to #2595, #9701, #11310, #345, #1158, #7494, #7503, #8128, #8560, #8673, #9456, #9667, #9985, #10617, #11145 by thomie:
keywords to GADTs

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