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/// This header provides classes for managing passes over SCCs of the call
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/// graph. These passes form an important component of LLVM's interprocedural
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/// optimizations. Because they operate on the SCCs of the call graph, and they
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/// wtraverse the graph in post order, they can effectively do pair-wise
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/// traverse the graph in post order, they can effectively do pair-wise
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/// interprocedural optimizations for all call edges in the program. At each
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/// call site edge, the callee has already been optimized as much as is
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/// possible. This in turn allows very accurate analysis of it for IPO.
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