[ARM] FMINNAN/FMAXNAN of f64 are not legal.

This was my error. We've got f32 marked as legal because they're simulated using a v2f32 instruction, but there's no equivalent for f64.

This will get test coverage imminently when D12015 lands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244916 91177308-0d34-0410-b5e6-96231b3b80d8
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