TTG: Refactor HsBracket

compiler/GHC/Hs/Expr.hs

compiler/GHC/Hs/Instances.hs

compiler/GHC/Hs/Syn/Type.hs

compiler/GHC/HsToCore/Coverage.hs

compiler/GHC/HsToCore/Expr.hs

compiler/GHC/HsToCore/Quote.hs

compiler/GHC/Iface/Ext/Ast.hs

compiler/GHC/Rename/Splice.hs

compiler/GHC/Tc/Gen/Expr.hs

compiler/GHC/Tc/Gen/Splice.hs

compiler/GHC/Tc/Types/Origin.hs

compiler/GHC/Tc/Utils/Zonk.hs

compiler/Language/Haskell/Syntax/Expr.hs

compiler/Language/Haskell/Syntax/Extension.hs