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Author SHA1 Message Date
Krzysztof Parzyszek 10fbac009d [Hexagon] Avoid infinite loops in HexagonLoopIdiomRecognition 
- Avoid explosive growth of the simplification queue by not queuing
  expressions that are alredy in it.
- Add an iteration counter and abort after a sufficiently large number
  of iterations (assuming that it's a symptom of an infinite loop).

llvm-svn: 298655
 2017-03-23 23:01:22 +00:00