llvm dev - Jan 2019 - BPFTargetLowering missing custom implementation?

In BPFISelLowering.cpp the OperationAction for `CTTZ`, `CTLZ`,
`CTTZ_ZERO_UNDEF`, and `CTLZ_ZERO_UNDEF` are set to `Custom` but
`BPFTargetLowering::LowerOperation` is missing a case for them.

This will cause an assert if these Operations are ever used with BPF?  Is
this intended?

Thanks!
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