[PATCH] Eliminate constant-extender profitability checks from Hexagon isel

[Krzysztof Parzyszek]

Hi colinl,

Replace ExtPred predicates with the corresponding ImmPred predicates.  Remove profitability checks from ISel.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8264

Files:
  lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
  lib/Target/Hexagon/HexagonInstrInfo.td
  lib/Target/Hexagon/HexagonInstrInfoV4.td
  lib/Target/Hexagon/HexagonInstrInfoV5.td
  lib/Target/Hexagon/HexagonIntrinsics.td
  lib/Target/Hexagon/HexagonIntrinsicsV4.td
  lib/Target/Hexagon/HexagonOperands.td

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