[5.0][SourceKit] Add defensive guard for invalid offset #14871
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Invalid offset used to cause a inifinite loop in Lexer in some race condition. This is a quick fix until we fix underlying problem in SourceKit.
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Cherry-pick of #14803 for swift-5.0-branch
Invalid offset used to cause a inifinite loop in Lexer in some race
condition.
This is a quick fix until we fix underlying problem in SourceKit.