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

[Marcos Maronas via llvm-commits]

maarquitos14 wrote:

@svenvh @AlexVlx @michalpaszkowski  @bader just pinging to see if you have any comments about this PR. Otherwise, as this already has 3 approvals, I'll ask gatekeepers to merge in a couple of days.

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