[compiler-rt] [scudo] Add EnableMultiRegions mode (PR #98076)

[Christopher Ferris via llvm-commits]

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@@ -56,6 +56,17 @@ template <typename Config> class SizeClassAllocator64 {
   static_assert(RegionSizeLog >= GroupSizeLog,
                 "Group size shouldn't be greater than the region size");
   static const uptr GroupScale = GroupSizeLog - CompactPtrScale;
+  // Local cache stores the pointers in the type of compacted pointer and the
+  // compaction is done by calculating the offset to the base address of a
+  // region. Currently, we don't support decompacting through multiple regions
+  // because of the concern of performance and so we disable the pointer
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cferris1000 wrote:

because of ... -> due to performance concerns, we disable pointer compaction.

https://github.com/llvm/llvm-project/pull/98076