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If dominator tree is not calculated or is invalidated, set corresponding pointer in the pass state to nullptr. Such pointer value will indicate that operations with dominator tree are not allowed. In particular, it allows to skip verification for such pass state. The dominator tree is not calculated if the machine dominator pass was skipped, it occures in the case of entities with linkage available_externally. The change fixes some test fails observed when expensive checks are enabled. Differential Revision: https://reviews.llvm.org/D29280 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296742 91177308-0d34-0410-b5e6-96231b3b80d8
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