Dan Gohman e8f4ac2b10 Update VarInfo's comments to reflect the current code. LiveVar
no longer records a unique defining instruction, and virtual
registers may have multiple kills while still being defined
and killed in the same block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59145 91177308-0d34-0410-b5e6-96231b3b80d8
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