[PATCH] Fix three bugs in loop unswitching related to trivial unswitching and the threshold parameter

[Bjarke Hammersholt Roune]

Change unswitching cost calculation from std::min(NumInstructions, 5 * NumBlocks) to NumInstructions.


http://reviews.llvm.org/D10376

Files:
  lib/Transforms/Scalar/LoopUnswitch.cpp
  test/Transforms/LoopUnswitch/2015-06-10-Threshold.ll
  test/Transforms/LoopUnswitch/2015-06-10-Trivial.ll

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