sched: fix latency of memory dependence chain edges for consistency.
For store->load dependencies that may alias, we should always use TrueMemOrderLatency, which may eventually become a subtarget hook. In effect, we should guarantee at least TrueMemOrderLatency on at least one DAG path from a store to a may-alias load. This should fix the standard mode as well as -enable-aa-sched-mi". llvm-svn: 158380
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