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8f98d70a9b
BumpPtrAllocator-allocated region to allow it to be stored in a more compact form and to avoid the need for a non-trivial destructor call. Use this new mechanism in ScalarEvolution instead of FastFoldingSetNode to avoid leaking memory in the case where a FoldingSetNodeID uses heap storage, and to reduce overall memory usage. llvm-svn: 98829