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JIT: Do greedy 4-opt for backward jumps in 3-opt layout (dotnet#110277)
Part of dotnet#107749. Follow-up to dotnet#103450. Greedy 3-opt (i.e. an implementation that requires each move to be profitable on its own) is not well-suited for discovering profitable moves for backward jumps, as such movement requires an unrelated move to first place the source block lexically behind the destination block. Thus, the 3-opt implementation added in dotnet#103450 incorporates a 4-opt move for backward jumps, where we partition 1) before the destination block, 2) before the source block, and 3) directly after the source block. This 4-opt implementation can be expanded to search for the best cut point between the destination and source blocks to maximize its efficacy.
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