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[asan] Avoid lifetime analysis for allocas with can be in ambiguous s…
…tate Summary: C allows to jump over variables declaration so lifetime.start can be avoid before variable usage. To avoid false-positives on such rare cases we detect them and remove from lifetime analysis. PR27453 PR28267 Reviewers: eugenis Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24321 llvm-svn: 280880
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