Dan Gohman 6556c8962c Add the ability to "intern" FoldingSetNodeID data into a ...

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

2010-03-18 16:16:38 +00:00

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