[llvm] [SPIRV] Change how to detect OpenCL/Vulkan Env and update tests accordingly. (PR #129689)

[Marcos Maronas via llvm-commits]

maarquitos14 wrote:

@Keenuts @bader @VyacheslavLevytskyy @MrSidims @michalpaszkowski this is ready for review now. Note that this changed significantly since the first time it was open. 

https://github.com/llvm/llvm-project/pull/129689