Chris Lattner ca56feaf38 add a new setNumChildren method for resizing scopes. Tweak getHash() so
that we never return a tombstone value, which (thankfully) triggers an
assert in densemap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97214 91177308-0d34-0410-b5e6-96231b3b80d8
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