[NVPTX] Add more clear error message for using invalid syncscope (#165737)

Using invalid syncscopes on certain NVVM intrinsics causes an obscure
error to appear: (error 9: NVVM_ERROR_COMPILATION), libNVVM extra log:
Could not find scope ID=5.

This is not a very helpful error. A much more useful error would be
something like 'NVPTX does not support syncscope "agent"'

This would immediately make it clear that the issue is not NVPTX
specific, but actually from code being fed to NVPTX. This would save
users time in debugging issues related to this.

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