[SILOptimizer] Properly disconnect the signature optimized function from a parent class. #17539
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…rom a parent class. The new function with an optimized signature _shouldn't_ have a non-trivial classSubclassScope, even if the original function did, since the original function (that becomes the thunk) is the symbol that serves that role. Also part of rdar://problem/40738913
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The new function with an optimized signature shouldn't have a non-trivial
classSubclassScope, even if the original function did, since the original
function (that becomes the thunk) is the symbol that serves that role.
Also part of rdar://problem/40738913
A missed case in #16959