[PATCH] Fix flakiness in fp16-promote.ll

[Pirama Arumuga Nainar]

> In any case, bots are still broken, so this should be fixed one way or the other, soon ;)


How about I commit this patch (sans the .fnstart), so I don't block others?  I'll either add explicit register checks or merge the duplicate checks in a followup patch after we decide about the right strategy?


http://reviews.llvm.org/D9112

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