[clang] [llvm] Make OpenCL an OSType rather than an EnvironmentType. (PR #170297)

[Marcos Maronas via llvm-commits]

maarquitos14 wrote:

> Test changes imply that AMD team is using the OpenCL EnvironmentType. @yxsamliu, are you okay with this change?

Yes, thanks for tagging somebody. I was planning to ask if anybody from AMD could have a look at this. I suspect `OpenCL` was originally added as `EnvironmentType` because of these tests. Likely, the patch was failing for these tests, and they added it as `EnvironmentType` to fix errors.

https://github.com/llvm/llvm-project/pull/170297