llvm dev - Aug 2019 - `opt-out` attributes for intrinsics

Right now I'm annotating intrinsics with new nosync function attribute (
https://reviews.llvm.org/D65377)

After some discussion it was decided to ask how the community feels about
`opt-out` attribute list for intrinsics?

For a start some attributes that can be added on the list could be: nosync,
nofree, nounwind, willreturn.

Suggestions are welcome.

Thanks,
Stefan
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