[PATCH] Adding skeleton for unit testing Hexagon Code Emission

[colinl at codeaurora.org]

Hi shankar.easwaran, sidneym,

Adding and modifying CMakeLists.txt files to run unit tests under unittests/Target/* if the directory exists.
Adding basic unit test to check that code emitter object can be retrieved.

http://reviews.llvm.org/D5523

Files:
  lib/Target/Hexagon/CMakeLists.txt
  lib/Target/Hexagon/MCTargetDesc/CMakeLists.txt
  lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp
  lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.h
  lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
  lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
  unittests/CMakeLists.txt
  unittests/Target/CMakeLists.txt
  unittests/Target/Hexagon/CMakeLists.txt
  unittests/Target/Hexagon/HexagonMCCodeEmitterTest.cpp
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