[5.0][Lexer] Don't setEscapedIdentifier(true) for tok::eof at ArtificialEOF #14553
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https://bugs.swift.org/browse/SR-6926 This happens when the Parser re-lexing comment tokens that sets ArtificialEOF at the end of comment range. It used to cause an assertion failure: (!value || Kind == tok::identifier) && "only identifiers can be escaped identifiers"
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Cherry-pick of #14505