[Openmp-dev] Declare variant + Nvidia Device Offload

[Jon Chesterfield via Openmp-dev]

>
> > _$_ seems like a reasonable solution, as ISO C/C++ forbids dollar-sign
> I CC'ed Ravi and Jon to confirm that Intel and AMD toolchains will be
> be fine with "$" in the symbol name. We already know it should work for
> NVIDIA and NEC. I guess that would be all.
>

'$' works fine on amdgcn. We're using llvm-mc for the assembler and
(nearly?) standard elf for the binary formats so it should work really.
Hello world style test passes too.

Embedded \0 in the middle of the symbol name was rejected in IR but
anything else seems to work.

Thanks!

Jon
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