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from a dot file that is the output of DSA. Nodes to extract are specified by giving the name of the node seen in the graphical representation, i.e. in the .ps if the node is specified %xyz asking for just x, xy, or xyz will retain it in the output file. Because it operates on substrings underspecifying may result in additional unexpected nodes. Be as specific as possible. Obviously, however, if you ask for %xyz and there is a getelementptr of %xyz you will get both nodes. Some manual editing may still be necessary because of this, but this script can pare down 10,000 line files to 20 line files, making like easier. llvm-svn: 24851