Fix trivial bug in callee analysis: thin functions aren't necessarily function refs. #12013
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Explanation: This fixes a compiler crash when a thin function, which is not function reference, is converted to a thick function (a closure).
Scope of Issue: This is a rare case, but we have seen it in real world code
Risk: Low.
Reviewed By: Erik (The original fix is from John: #11893)
Testing: There is a regression test for it
Radar: rdar://problem/34498887