[PATCH] [Hexagon] Update AnalyzeBranch, etc. target hooks

[Brendon Cahoon]

Hi sundeepk, colinl,

Improved the AnalyzeBranch, InsertBranch, and RemoveBranch functions in order to handle more of our branch instructions. This requires changes to analyzeCompare and PredicateInstructions. Specifically, we've added support for new value compare jumps, improved handling of endloop, added more compare instructions, and improved support for predicate instructions.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9559

Files:
  lib/Target/Hexagon/HexagonHardwareLoops.cpp
  lib/Target/Hexagon/HexagonInstrInfo.cpp
  lib/Target/Hexagon/HexagonInstrInfo.h
  test/CodeGen/Hexagon/alu64.ll
  test/CodeGen/Hexagon/remove-endloop.ll

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