Commit ae692f2b authored by Andrew Trick's avatar Andrew Trick
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misched: Infrastructure for weak DAG edges. 

This adds support for weak DAG edges to the general scheduling
infrastructure in preparation for MachineScheduler support for
heuristics based on weak edges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167738 91177308-0d34-0410-b5e6-96231b3b80d8
parent 95d8afc5
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