For sanity, create a root when NumDataSuccs >= 4. Splitting large subtrees will no longer be detrimental after my next checkin to handle nested tree. A magic number of 4 is fine because single subtrees seldom rejoin more than this. It makes subtrees easier to visualize and heuristics more sane. llvm-svn: 173399
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The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
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