Nate Begeman d5811b965d Fix PR681 by using the standard Lengauer and Tarjan algorithm for dominator ...

set construction, rather than intersecting various std::sets.  This reduces
the memory usage for the testcase in PR681 from 496 to 26MB of ram on my
darwin system, and reduces the runtime from 32.8 to 0.8 seconds on a
2.5GHz G5.  This also enables future code sharing between Dom and PostDom
now that they share near-identical implementations.

llvm-svn: 26707

2006-03-11 02:20:46 +00:00

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