[PATCH] D22959: MachineLoopInfo: add methods findLoopPreheader and getExitingBlock

[Sjoerd Meijer via llvm-commits]

SjoerdMeijer created this revision.
SjoerdMeijer added reviewers: bcahoon, kparzysz, spatel, bkramer, jmolloy.
SjoerdMeijer added a subscriber: llvm-commits.

This adds two new utility functions findLoopPreheader and getExitingBlock to MachineLoopInfo.
These functions are refactored and taken from the Hexagon target as they are target independent.

https://reviews.llvm.org/D22959

Files:
  include/llvm/CodeGen/MachineLoopInfo.h
  lib/CodeGen/MachineLoopInfo.cpp
  lib/Target/Hexagon/HexagonHardwareLoops.cpp

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