[PATCH] Add support to promote f16 to f32

[Pirama Arumuga Nainar]

Thanks for the code review ab.  I'll make your suggestions, as well as remove the command line option.

Looks like the Mips backend isn't setting the right operation action for FP_TO_FP16.  I'll fix that in a different patch.


http://reviews.llvm.org/D8755

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