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Summary: This change reverts r318575 and changes FindDynamicShadowStart() to keep the memory range it found mapped PROT_NONE to make sure it is not reused. We also skip MemoryRangeIsAvailable() check, because it is (a) unnecessary, and (b) would fail anyway. Reviewers: pcc, vitalybuka, kcc Subscribers: srhines, kubamracek, mgorny, llvm-commits, hiraditya Differential Revision: https://reviews.llvm.org/D40203 llvm-svn: 318666