Fix scoped type variables in TH for several constructs
Namely class methods, default signatures and pattern synonyms. When scoped type variables occur inside class default methods, default signatures and pattern synonyms, avoid re-create explicit type variables when represent the type signatures. This patch should fix Trac#14885. Signed-off-by:HE, Tao <sighingnow@gmail.com> Test Plan: make test TEST="T14885a T14885b T14885c" Reviewers: goldfire, bgamari, simonpj, RyanGlScott Reviewed By: simonpj, RyanGlScott Subscribers: rwbarton, thomie, carter GHC Trac Issues: #14885 Differential Revision: https://phabricator.haskell.org/D4469
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