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Commit 0d45bbcb authored by Chia-hung Duan's avatar Chia-hung Duan
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[scudo] Skip releaseToOSMaybe if there's no byte in freelist 

In primary32, the unused region will have max/min region index with 0
value and it's an invalid index. Skip releaseToOSMaybe in both primary32
and primary64 even it's M_PURGE_ALL.

Differential Revision: https://reviews.llvm.org/D150243
parent 642bd112
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