Untabify template-haskell.
Remove unboxed Int# fields from NameFlavour (#9527)
Derive Generic for TH types (#9527)
Test #8100 in th/T8100
Fix #8100, by adding StandaloneDerivD to TH's Dec type.
Test #9064 in th/T9064
Fix #9064 by adding support for generic default signatures to TH.
Test #9204 in roles/should_fail/T9204
Fix #9204 by outputting extra info on boot file mismatch. [skip ci]

(still in progress)