[commit: ghc] wip/restore-ttg's head updated: Restore TTG Path 3 (5b13283)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/restore-ttg' now includes:

     faec8d3 Track type variable scope more carefully.
     ef44382 Apply the interim fix for #14119 to liftCoMatch
     3eaa55d Apply Note [EtaAppCo] in OptCoercion to another case
     1845d1b Clarify comments around dropping Derived constraints
     07abff7 Test #14884, #14969
     9187d5f Allow unpacking of single-data-con GADTs
     5ab8094 SpecConstr: accommodate casts in value arguments
     ddf8955 Mark test as expected to pass.
     d8d4266 Fix #14991.
     72b5f64 Fix accidental breakage in T7050
     c2f90c8 Remove unused bdescr flag BF_FREE
     891ffd5 Comments only, about exitifcation
     54acfbb base: Add dependency on GHC.Integer in a few boot files
     875e59d testsuite: Accept output for T12593
     718a018 Fix #14238 by always pretty-printing visible tyvars
     5819ae2 Remove HasSourceText and SourceTextX classes
     d386cd6 Collect build artifacts with S3
     26cfe29 Document SumTyCon
     7bd7fec Improve documentation for refineDefaultAlt
     605ae8d Run tests after artifact collection
     a5bfb7e CoreUtils.filterAlts: Correct docs
     8b823f2 docs(Data.Function): fix and augment `on` annotation
     b92ed28 Restore TTG 1
     4e038c9 Restore TTG patch #2
     5b13283 Restore TTG Path 3