Jakob Stoklund Olesen c4a2715a54 Drop ZeroIndex and InvalidIndex.
They are not used any more. Simply use SlotIndex() to get an invalid
index.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149727 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-04 00:11:06 +00:00
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