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Radically simplify the SlotMachine. There is no need to keep Value planes around any more. This change causes slot numbering to number all un-named, non-void values starting at 0 and incrementing monotonically through the function, regardless of type (including BasicBlocks). Getting slot numbers is now a single lookup operation instead of a double lookup. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35171 91177308-0d34-0410-b5e6-96231b3b80d8