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Commit b0f32183 authored by Chris Lattner's avatar Chris Lattner
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Substantially improve the DSA code by removing 'forwarding' nodes from 

DSGraphs while they are forwarding.  When the last reference to the forwarding
node is dropped, the forwarding node is autodeleted.  This should simplify
removeTriviallyDead nodes, and is only (efficiently) possible because we are
using an ilist of dsnodes now.

llvm-svn: 11175
parent 5592af79
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