Change ExplodedNode to have its NodeGroups all BumpPtrAllocated, avoiding malloc() traffic when adding successors/predecessors to a node. This was done by introducing BumpVector, which is essentially SmallVector with all memory being BumpPtrAllocated (this can certainly be cleaned up or moved into llvm/ADT).

This change yields a 1.8% speed increase when running the analyzer (with -analyzer-store=region) on a small benchmark file.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83439 91177308-0d34-0410-b5e6-96231b3b80d8

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