[Demangler] Fix for crash in mangleSingleChildNode. #38002
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PartialApplyForwarders can apparently have no children in some cases, so avoid calling mangleSingleChildNode() if that happens in order to avoid a crash. rdar://63678141
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PartialApplyForwarders can apparently have no children in some cases, so avoid calling mangleSingleChildNode() if that happens in order to avoid a crash.
rdar://63678141