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Commit fae3534b authored by Denys Petrov's avatar Denys Petrov
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[analyzer] Use Optional as a return type of StoreManager::castRegion 

Summary: Make StoreManager::castRegion function usage safier. Replace `const MemRegion *` with `Optional<const MemRegion *>`. Simplified one of related test cases due to suggestions in D101635.

Differential Revision: https://reviews.llvm.org/D103319
parent c123c178
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