[PATCH] [ConstantFolding] Fix wrong folding of intrinsic 'convert.from.fp16'.

[Andrea Di Biagio]

Hi Ahmed, 
I updated the patch based on your previous feedback.

This patch is much simpler now. As you suggested, I also added extra tests for values different than zero.

Please let me know what you think.
Thanks!
-Andrea


http://reviews.llvm.org/D9771

Files:
  lib/Analysis/ConstantFolding.cpp
  test/Transforms/ConstProp/convert-from-fp16.ll

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