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Summary: Processing of command-line definition of variable and logic around implicit not directives both reuse parsing code that expects a line number to be defined. So far, a special line number of 0 was used for those users of the parsing code where a line number does not make sense. This commit instead represents line numbers as Optional values so that they can be None for those cases. Reviewers: jhenderson, chandlerc, jdenny, probinson, grimar, arichardson, rnk Subscribers: JonChesterfield, rogfer01, hfinkel, kristina, rnk, tra, arichardson, grimar, dblaikie, probinson, llvm-commits, hiraditya Tags: #llvm Differential Revision: https://reviews.llvm.org/D64639 llvm-svn: 366109
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