Remove unsafe AssertZext after promoting result of FP_TO_FP16
Summary:
Some target lowerings of FP_TO_FP16, for instance ARM's vcvtb.f16.f32
instruction, do not guarantee that the top 16 bits are zeroed out.
Remove the unsafe AssertZext and add tests to exercise this.
Reviewers: jmolloy, sbaranga, kristof.beyls, aadg
Subscribers: llvm-commits, srhines, aemerson
Differential Revision: http://reviews.llvm.org/D18426
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264285
91177308-0d34-0410-b5e6-
96231b3b80d8
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