[PATCH] ScheduleDAGInstrs::buildSchedGraph() rewritten.

[Jonas Paulsson]

Fixes according to Hal Finkels suggestions.

Bugfixing in reduceHugeMemNodeMaps() (Some details had gotten lost in the revision process):

  After a reduction of maps:
    Don't forget to recompute NumNodes.
    Don't forget to add dep to old BarrierChain.
    Check for potential loop with newBarrierChain.


http://reviews.llvm.org/D8705

Files:
  include/llvm/CodeGen/PseudoSourceValue.h
  include/llvm/CodeGen/ScheduleDAG.h
  include/llvm/CodeGen/ScheduleDAGInstrs.h
  lib/CodeGen/ScheduleDAGInstrs.cpp

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