[llvm] [SPIRV] Split async copy tests and fix invalid tests (PR #178718)

[Steven Perron via llvm-commits]

https://github.com/s-perron commented:

Seems fine to me, but these are not tests that I know very well. I can't say of the changes to the test are appropriate. 

https://github.com/llvm/llvm-project/pull/178718