[PATCH] [Hexagon] Generate more hardware loops

[Brendon Cahoon]

Hi sundeepk, iajbar,

Hexagon is now able to more hardware loop opportunities. This patch also adds more tests for hardware loops.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9568

Files:
  lib/Target/Hexagon/HexagonHardwareLoops.cpp
  test/CodeGen/Hexagon/hwloop-lt.ll
  test/CodeGen/Hexagon/hwloop-missed.ll
  test/CodeGen/Hexagon/hwloop-preheader.ll
  test/CodeGen/Hexagon/hwloop1.ll
  test/CodeGen/Hexagon/hwloop2.ll
  test/CodeGen/Hexagon/hwloop3.ll
  test/CodeGen/Hexagon/hwloop4.ll

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