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The test case 'checkFlexiblePatterns' caused a failure in: https://lab.llvm.org/buildbot/#/builders/85/builds/11590 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior runtime error: applying zero offset to null pointer llvm/lib/Support/regengine.inc:151:18 The logical view is traversed and for each logical element a series of match criterias are applied. One of those criterias is to match its name or type name to a given pattern. If the logical element does not have a type (for instance a 'namespace') do not try to use its type name, which is a empty string as the 'matcher' function receives a null pointer. Reviewed By: probinson Differential Revision: https://reviews.llvm.org/D136444