[PATCH] ScheduleDAGInstrs::buildSchedGraph() rewritten.

[Andrew Trick]

Unless it can be shown by measuring compile time that the implementation needs to be defined in the header, I would:

(1) define insertBarrierChain in the .cpp file

(2) Forward declare and define Value2SUsMap and methods that call it in the .cpp file.


http://reviews.llvm.org/D8705

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