[llvm] Support: Do not check if a file exists before executing (PR #128821)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

@arsenm  The message check should probably be more general as our machine generates a different one. I have created an issue for this: https://github.com/llvm/llvm-project/issues/129208

https://github.com/llvm/llvm-project/pull/128821