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Remember the last choice for the top/bottom scheduling boundary in bidirectional scheduling mode. The top choice should not change if we schedule at the bottom and vice versa. This allows us to improve compiletime: We only recalculate the best pick for one border and re-use the cached top-pick from the other border. Differential Revision: http://reviews.llvm.org/D19350 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273766 91177308-0d34-0410-b5e6-96231b3b80d8
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