[PATCH] Fix crash in LICM due to unreachable uses after LCSSA

[Amara Emerson]

Clean up tests a bit.

http://reviews.llvm.org/D4207

Files:
  lib/Transforms/Utils/LCSSA.cpp
  test/Transforms/LCSSA/unreachable-use.ll
  test/Transforms/LCSSA/unreachable-uses-undef.ll
  test/Transforms/LICM/lcssa-unreachable-crash.ll
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