[MachineScheduler] Add option to control reordering for store/load clustering (#75338) Reordering based on the sort order of the MemOpInfo array was disabled in <https://reviews.llvm.org/D72706>. However, it's not clear this is desirable for al targets. It also makes it more difficult to compare the incremental benefit of enabling load clustering in the selectiondag scheduler as well was the machinescheduler, as the sdag scheduler does seem to allow this reordering. This patch adds a parameter that can control the behaviour on a per-target basis. Split out from #73789.
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