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

[Mikael Holmen via llvm-commits]

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+; RUN: not llc -mcpu=sm_100a -mtriple=nvptx64 -mattr=+ptx86 %s 2>&1 | FileCheck %s
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mikaelholmen wrote:

Hi @smada3 

Can we add "-o /dev/null" or "-o -" to the RUN line so it doesn't try to open a local file for the llc output since the local directory might be write protected?

https://github.com/llvm/llvm-project/pull/165737