[compiler-rt] [scudo] Add flags to secondary cache entries. (PR #177506)

[via llvm-commits]

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@@ -754,9 +760,12 @@ MapAllocator<Config>::tryAllocateFromCache(const Options &Options, uptr Size,
   LargeBlock::Header *H = reinterpret_cast<LargeBlock::Header *>(
       LargeBlock::addHeaderTag<Config>(EntryHeaderPos));
   bool Zeroed = Entry.Time == 0;
+
+  if (UNLIKELY(Entry.Flags & CachedBlock::NoAccess))
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ChiaHungDuan wrote:

Can we add a comment to say something like setMemoryPermission(..., 0) resets the page to default access? I was under the impression that 0 means NoAccess while having a quick glance.

https://github.com/llvm/llvm-project/pull/177506