Opaque pointers mode is enabled by default, no need to explicitly enable it.
The LIT test cases were migrated with the script provided by Nikita Popov. Due to the size of the change it is split into several parts. Reviewed By: nemanja, amyk, nikic, PowerPC Differential Revision: https://reviews.llvm.org/D135470
In the context of atomic load, integer, pointer and float point types are allowed, thus we should allow llvm.ppc.cfence to accept any type mentioned. Fixes https://github.com/llvm/llvm-project/issues/55983. Reviewed By: shchenz, vchuravy Differential Revision: https://reviews.llvm.org/D127554