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Previously, GHC checked for bad levity polymorphism to the left of all
arrows in data constructors. This was wrong, as reported in #12911
(where an example is also shown). The solution is to check each
individual argument for bad levity polymorphism. Thus the check has
been moved from TcValidity to TcTyClsDecls.
A similar situation exists with pattern synonyms, also fixed here.
This patch also nabs #12819 while I was in town.
Test cases: typecheck/should_compile/T12911, patsyn/should_fail/T12819
Test Plan: ./validate
Reviewers: simonpj, austin, bgamari
Reviewed By: bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D2783
GHC Trac Issues: #12819, #12911
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