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Fix uninitialized variable in GoParser
Summary: `m_last_tok` isn't initialized anywhere before it's used the first time (most likely in the `GoParser::Rule::error` method), which causes most of the GoParser tests to fail with sanitizers enabled with errors like this: ``` GoParser.cpp:52:21: runtime error: load of value <random value>, which is not a valid value for type 'GoLexer::TokenType' UndefinedBehaviorSanitizer: undefined-behavior GoParser.cpp:52:21 ``` Reviewers: ribrdb, davide, labath Reviewed By: labath Subscribers: labath, lldb-commits Differential Revision: https://reviews.llvm.org/D42339 llvm-svn: 323119
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